What are the cheapest airlines flying from Seattle to Porto round-trip?

Our cheapest airline available from Seattle to Porto is United Airlines. Our recent data shows that you can find tickets from as low as $683 on this airline. Additional options worth looking into are Lufthansa and Delta, starting at $734 and $881 round-trip. Users have found that United Airlines is 40% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from Seattle to Porto one-way?

$706 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Turkish Airlines and American Airlines, with prices starting from $729 and $811, respectively.

How recently were the Seattle to Porto flight deals updated?

The Seattle to Porto flight deals you see on this page were last updated on 6/1.

What is the cheapest month to book a flight from Seattle to Porto?

Currently, January is the cheapest month in which you can book a flight from Seattle to Porto (average of $523). Flying from Seattle to Porto in June is currently the most expensive (average of $994). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What are the most popular airlines that fly from Seattle to Porto?

When booking a flight from Seattle to Porto, you may want to consider flying on American Airlines, Air France or British Airways as they are the most popular for this route.

Can I find flights from Seattle to Porto for under $700 on Cheapflights?

Yes, there are multiple flights from Seattle to Porto for under $700. The cheapest flight booked recently is on United Airlines for just $683, but on average you can expect to pay $871.

Are there last-minute flights available from Seattle to Porto for under $1,000?

There are currently 11+ open flights from Seattle to Porto within the next 7 days for less than $1,000.

What does SEA to OPO mean?

This is defined as Seattle/Tacoma Intl Airport (SEA) and Porto Airport (OPO). Codes like Porto Airport are often used to just call airports uniquely.

Can I find deals for flights from Seattle to Porto that include extra baggage allowance?

The amount of baggage you can bring on your Seattle to Porto flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

Can I find deals on flights from Seattle to Porto with specific airlines?

Yes, Cheapflights allows you to browse and filter Seattle to Porto flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

Can I find deals for flights from Seattle to Porto that include hotel bookings?

Yes. In addition to deals on Seattle to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Seattle to Porto?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Porto.

Can I find deals for business class flights from Seattle to Porto?

Yes. Cheapflights offers flight deals from Seattle to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Can I find deals for flights from Seattle to Porto that allow pets onboard?

Many airlines flying from Seattle to Porto offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

Can I find deals on last-minute flights from Seattle to Porto?

Yes, you can often find last-minute deals on Seattle to Porto flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

Flights from Seattle, WA to Porto, Portugal from $309

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

The best prices from Seattle/Tacoma Intl to Porto are usually found in February or November, booked 16 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap flight deals from Seattle to Porto

Popular in	June
Cheapest in	February
Average price	$1,689
Round-trip from	$523

High demand for flights, 32% potential price rise

Search Deals

Best time to find cheap flights, 34% potential price drop

Search Deals

Average for round-trip flights in June 2024

Search Deals

From Seattle/Tacoma Intl to Porto

Search Deals

What is the cheapest day to fly round-trip from Seattle to Porto?

Flights from Seattle to Porto are found to be more expensive on Thursday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Porto.

How far in advance should I book a flight from Seattle to Porto?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 17 days in advance, which can save you up to 52% on flights from Seattle to Porto compared to booking the week you need them. Waiting 17 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $984. For sooner than that we have options available in the next 3 days from $2,570.

What is the cheapest month to fly from Seattle to Porto?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, February can be a great choice for travel to Porto. Flights to Porto from Seattle in February are about $1,145 on average during February, but can be found for as low as $693.

What is the cheapest time of day to fly from SEA to OPO?

It’s optimal to fly from Seattle to Porto in the morning. By choosing this option you can save up to 5% on the cost of your flight, compared to a flight in the evening.

Cheap Turkish Airlines flights from Seattle to Porto

Consider these cheap Turkish Airlines flights we've found departing from Seattle to Porto. Be sure to come back soon if the deals available don't appeal to you at this time.

man. 9/166:40 pmSEA - OPO

1 stop37h 20mTurkish Airlines

tor. 9/264:50 pmOPO - SEA

1 stop31h 55mTurkish Airlines

Deal found 6/1$930

søn. 9/156:40 pmSEA - OPO

1 stop31h 35mTurkish Airlines

søn. 9/225:25 pmOPO - SEA

1 stop31h 20mTurkish Airlines

Deal found 6/1$968

tor. 9/2612:15 pmSEA - OPO

1 stop19h 35mTurkish Airlines

man. 10/74:50 pmOPO - SEA

1 stop25h 40mTurkish Airlines

Deal found 5/31$1,007

tor. 9/2612:15 pmSEA - OPO

1 stop19h 35mTurkish Airlines

fre. 10/1110:45 amOPO - SEA

1 stop31h 45mTurkish Airlines

Deal found 5/31$1,037

tor. 9/2612:15 pmSEA - OPO

1 stop19h 35mTurkish Airlines

søn. 10/65:25 pmOPO - SEA

1 stop31h 20mTurkish Airlines

Deal found 5/31$1,047

Cheap KLM flights from Seattle to Porto

Some of the best deals we've found on KLM flights traveling from Seattle to Porto. Ensure the flight price, dates, time, and airline match your criteria before you book.

tir. 9/246:10 pmSEA - OPO

1 stop20h 05mKLM

tir. 10/84:20 pmOPO - SEA

1 stop26h 15mKLM

Deal found 5/31$894

tir. 9/176:10 pmSEA - OPO

1 stop20h 05mKLM

tor. 9/266:30 amOPO - SEA

2 stops21h 25mKLM

Deal found 6/1$904

fre. 10/46:05 pmSEA - OPO

1 stop20h 10mKLM

søn. 10/134:20 pmOPO - SEA

1 stop26h 15mKLM

Deal found 6/1$994

man. 9/166:10 pmSEA - OPO

1 stop20h 05mKLM

tor. 9/266:30 amOPO - SEA

2 stops21h 25mKLM

Deal found 6/1$1,038

lør. 6/86:05 pmSEA - OPO

1 stop20h 10mKLM

lør. 6/224:20 pmOPO - SEA

1 stop26h 00mKLM

Deal found 6/1$1,048

man. 9/239:15 pmSEA - OPO

2 stops17h 00mKLM

man. 10/78:40 pmOPO - SEA

1 stop21h 55mKLM

Deal found 5/31$1,113

ons. 9/259:15 pmSEA - OPO

2 stops17h 00mKLM

man. 10/76:30 amOPO - SEA

2 stops20h 45mKLM

Deal found 5/31$1,182

ons. 7/101:25 pmSEA - OPO

1 stop18h 15mKLM

tor. 8/16:30 amOPO - SEA

2 stops20h 50mKLM

Deal found 5/31$1,187

tor. 7/116:10 pmSEA - OPO

1 stop13h 30mKLM

tor. 8/16:30 amOPO - SEA

2 stops20h 50mKLM

Deal found 5/31$1,237

Cheap Seattle to Porto flights in June & July 2024

Listed are some of the best fares we've found on flights departing from Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.

man. 6/1011:00 pmSEA - OPO

2 stops32h 30mDelta

ons. 6/269:15 amOPO - SEA

1 stop16h 20mDelta

Deal found 6/1$936

man. 6/1011:00 pmSEA - OPO

2 stops25h 25mDelta

ons. 6/269:15 amOPO - SEA

2 stops32h 55mDelta

Deal found 6/1$942

lør. 6/81:35 pmSEA - OPO

1 stop17h 55mDelta

lør. 6/225:00 amOPO - SEA

2 stops24h 34mDelta

Deal found 6/1$1,046

lør. 6/86:05 pmSEA - OPO

1 stop20h 10mKLM

lør. 6/224:20 pmOPO - SEA

1 stop26h 00mKLM

Deal found 6/1$1,048

lør. 6/811:15 amSEA - OPO

2 stops20h 15mDelta

lør. 6/225:00 amOPO - SEA

2 stops24h 34mDelta

Deal found 6/1$1,050

tor. 6/1312:10 pmSEA - OPO

1 stop13h 35mUnited Airlines

søn. 6/1612:35 pmOPO - SEA

2 stops27h 27mUnited Airlines

Deal found 6/2$1,301

tor. 6/131:10 pmSEA - OPO

2 stops21h 20mSWISS

søn. 6/168:40 amOPO - SEA

2 stops17h 47mSWISS

Deal found 6/2$1,303

lør. 6/298:47 amSEA - OPO

3 stops29h 03mMultiple Airlines

lør. 7/61:30 pmOPO - SEA

3 stops33h 16mMultiple Airlines

Deal found 5/31$1,306

tor. 6/1312:10 pmSEA - OPO

1 stop13h 35mUnited Airlines

søn. 6/1612:10 pmOPO - SEA

1 stop32h 15mUnited Airlines

Deal found 6/2$1,343

Seattle to Porto 2024 flight deals

Listed are some of the best fares we've found on flights departing from Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.

lør. 11/211:50 pmSEA - OPO

2 stops28h 50mUnited Airlines

tir. 11/1212:30 pmOPO - SEA

2 stops28h 06mUnited Airlines

Deal found 6/1$683

lør. 11/211:50 pmSEA - OPO

2 stops28h 50mUnited Airlines

tir. 11/1212:30 pmOPO - SEA

1 stop31h 40mUnited Airlines

Deal found 6/1$690

lør. 11/23:00 pmSEA - OPO

1 stop17h 25mLufthansa

tir. 11/124:30 pmOPO - SEA

1 stop27h 40mLufthansa

Deal found 6/1$734

ons. 8/219:19 amSEA - OPO

3 stops24h 11mMultiple Airlines

søn. 9/87:10 amOPO - SEA

3 stops33h 35mMultiple Airlines

Deal found 6/1$851

ons. 9/256:15 pmSEA - OPO

1 stop30h 10mDelta

fre. 10/119:15 amOPO - SEA

1 stop16h 35mDelta

Deal found 5/31$881

ons. 9/256:15 pmSEA - OPO

1 stop30h 10mDelta

tor. 10/106:30 amOPO - SEA

1 stop36h 05mDelta

Deal found 5/31$883

tir. 9/2411:15 amSEA - OPO

2 stops20h 15mDelta

fre. 10/119:15 amOPO - SEA

1 stop16h 35mDelta

Deal found 5/31$884

tir. 9/2411:15 amSEA - OPO

2 stops20h 15mDelta

tor. 10/106:30 amOPO - SEA

1 stop36h 05mDelta

Deal found 5/31$886

ons. 9/256:15 pmSEA - OPO

1 stop30h 10mDelta

ons. 10/99:15 amOPO - SEA

2 stops22h 41mDelta

Deal found 5/31$891

Seattle to Porto flights leaving soon

Consider one of these great deals we found on last-minute flights from Seattle to Porto. To prevent any unwanted surprises, users should verify their flight info before booking.

man. 6/1011:00 pmSEA - OPO

2 stops32h 30mDelta

ons. 6/269:15 amOPO - SEA

1 stop16h 20mDelta

Deal found 6/1$936

man. 6/1011:00 pmSEA - OPO

2 stops25h 25mDelta

ons. 6/269:15 amOPO - SEA

2 stops32h 55mDelta

Deal found 6/1$942

lør. 6/81:35 pmSEA - OPO

1 stop17h 55mDelta

lør. 6/225:00 amOPO - SEA

2 stops24h 34mDelta

Deal found 6/1$1,046

lør. 6/86:05 pmSEA - OPO

1 stop20h 10mKLM

lør. 6/224:20 pmOPO - SEA

1 stop26h 00mKLM

Deal found 6/1$1,048

lør. 6/811:15 amSEA - OPO

2 stops20h 15mDelta

lør. 6/225:00 amOPO - SEA

2 stops24h 34mDelta

Deal found 6/1$1,050

tir. 6/117:00 amSEA - OPO

2 stops24h 30mWestJet

fre. 6/149:15 amOPO - SEA

2 stops19h 05mWestJet

Deal found 6/1$2,133

ons. 6/121:14 amSEA - OPO

2 stops46h 21mAmerican Airlines

søn. 6/1612:20 pmOPO - SEA

2 stops41h 26mAmerican Airlines

Deal found 6/2$2,281

tir. 6/1112:10 pmSEA - OPO

1 stop13h 35mUnited Airlines

fre. 6/1412:35 pmOPO - SEA

1 stop16h 48mUnited Airlines

Deal found 6/1$3,068

fre. 6/71:14 amSEA - OPO

2 stops26h 26mAmerican Airlines

lør. 6/228:15 amOPO - SEA

2 stops24h 32mAmerican Airlines

Deal found 6/1$4,043

One-way flights to Porto from Seattle

Users in need of a one-way flight from Seattle to Porto can choose from these deals. Those needing a return flight from Seattle to Porto can use the search form above.

man. 10/73:50 pmSEA - OPO

2 stops18h 50mMultiple Airlines

Deal found 5/30$309

ons. 10/21:50 pmSEA - OPO

3 stops24h 45mMultiple Airlines

Deal found 5/31$327

søn. 10/63:50 pmSEA - OPO

2 stops20h 35mMultiple Airlines

Deal found 5/31$344

tir. 10/83:50 pmSEA - OPO

2 stops19h 00mMultiple Airlines

Deal found 5/30$362

søn. 10/63:50 pmSEA - OPO

3 stops24h 40mMultiple Airlines

Deal found 5/31$385

ons. 10/93:50 pmSEA - OPO

2 stops18h 40mMultiple Airlines

Deal found 5/30$414

tir. 10/83:50 pmSEA - OPO

3 stops21h 25mMultiple Airlines

Deal found 5/30$440

man. 10/73:50 pmSEA - OPO

3 stops19h 15mMultiple Airlines

Deal found 5/30$446

ons. 10/21:50 pmSEA - OPO

2 stops38h 20mMultiple Airlines

Deal found 5/31$460

Find flights from Seattle to Porto within your budget

Fly from

Fly to

Budget

$683 - $1,033

Route

Depart

Return

Price

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lør. 11/2

2 stops28h 50m

Porto

tir. 11/12

2 stops28h 06m

$683

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

lør. 11/2

1 stop17h 25m

Porto

tir. 11/12

1 stop27h 40m

$734

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

ons. 8/21

3 stops24h 11m

Porto

søn. 9/8

3 stops33h 35m

$851

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

ons. 9/25

1 stop30h 10m

Porto

fre. 10/11

1 stop16h 35m

$881

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

tir. 9/24

1 stop20h 05m

Porto

tir. 10/8

1 stop26h 15m

$894

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

man. 9/16

1 stop37h 20m

Porto

tor. 9/26

1 stop31h 55m

$930

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

søn. 9/22

2 stops21h 05m

Porto

tir. 10/8

2 stops17h 46m

$1,014

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

ons. 9/25

2 stops21h 04m

Porto

tor. 10/10

2 stops20h 45m

$1,029

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

man. 9/23

2 stops34h 45m

Porto

tir. 10/8

2 stops17h 46m

$1,033

Flights are sorted by cheapest first

Deals found on 6/1

How far ahead should I book a flight from Seattle to Porto?

Booking 16 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Porto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Search Deals

What is the cheapest day to fly from Seattle to Porto?

Morning

Noon

Afternoon

Evening

All times are departure.

Travelers seeking maximum savings on their Seattle to Porto flight should consider departing on Saturday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Search Deals

Best time to book a flight from Seattle to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Seattle with our price prediction graph.

Estimated round-trip price

Temperature and rainfall in Porto by month

OPO Temperature	48.2 - 68 °F

OPO

Temperature

48.2 - 68 °F

Reviews of airlines servicing Porto

To help decide which airline to fly from Seattle to Porto, see what other customers have to say about Turkish Airlines, KLM and United Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

10,410 reviews

Check prices

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta

8.0

Very good

10,410 reviews

Delta

8.0

Very good

10,410 reviews

Check prices

Reviews

1 / 10

KLM

7.9

Good

1,507 reviews

Delta

8.0

Very good

10,410 reviews

Check prices

Reviews

1 / 10

SWISS

7.8

Good

1,940 reviews

Delta

8.0

Very good

10,410 reviews

Check prices

Reviews

1 / 10

Air France

7.5

Good

1,728 reviews

Delta

8.0

Very good

10,410 reviews

Check prices

Reviews

1 / 10

WestJet

7.5

Good

2,861 reviews

Delta

8.0

Very good

10,410 reviews

Check prices

Reviews

1 / 10

Related info for your journey

Can I find flights from Seattle to Porto for under $700 on Cheapflights?
Yes, there are multiple flights from Seattle to Porto for under $700. The cheapest flight booked recently is on United Airlines for just $683, but on average you can expect to pay $871.
Are there last-minute flights available from Seattle to Porto for under $1,000?
There are currently 11+ open flights from Seattle to Porto within the next 7 days for less than $1,000.
What are the cheapest airlines flying from Seattle to Porto round-trip?
Our cheapest airline available from Seattle to Porto is United Airlines. Our recent data shows that you can find tickets from as low as $683 on this airline. Additional options worth looking into are Lufthansa and Delta, starting at $734 and $881 round-trip. Users have found that United Airlines is 40% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Seattle to Porto one-way?
$706 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Turkish Airlines and American Airlines, with prices starting from $729 and $811, respectively.
What does SEA to OPO mean?
This is defined as Seattle/Tacoma Intl Airport (SEA) and Porto Airport (OPO). Codes like Porto Airport are often used to just call airports uniquely.
Can I find deals for flights from Seattle to Porto that include extra baggage allowance?
The amount of baggage you can bring on your Seattle to Porto flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.
Can I find deals on flights from Seattle to Porto with specific airlines?
Yes, Cheapflights allows you to browse and filter Seattle to Porto flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.
Can I find deals for flights from Seattle to Porto that include hotel bookings?
Yes. In addition to deals on Seattle to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to Porto?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Porto.
Can I find deals for business class flights from Seattle to Porto?
Yes. Cheapflights offers flight deals from Seattle to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
Can I find deals for flights from Seattle to Porto that allow pets onboard?
Many airlines flying from Seattle to Porto offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.
Can I find deals on last-minute flights from Seattle to Porto?
Yes, you can often find last-minute deals on Seattle to Porto flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.
How recently were the Seattle to Porto flight deals updated?
The Seattle to Porto flight deals you see on this page were last updated on 6/1.
What are the most popular airlines that fly from Seattle to Porto?
When booking a flight from Seattle to Porto, you may want to consider flying on American Airlines, Air France or British Airways as they are the most popular for this route.
What is the cheapest month to book a flight from Seattle to Porto?
Currently, January is the cheapest month in which you can book a flight from Seattle to Porto (average of $523). Flying from Seattle to Porto in June is currently the most expensive (average of $994). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Seattle to Porto
See prices for flight routes from nearby airports that may be better suited for you.

Seattle to Lisbon flights

Portland to Lisbon flights

Portland to Porto flights

Seattle to Ponta Delgada flights

Portland to Faro flights

Seattle to Faro flights

Spokane to Lisbon flights

Seattle to Funchal flights

Portland to Ponta Delgada flights

Pasco to Lisbon flights

Seattle to Pico Island flights

Seattle to Lajes flights

Spokane to Faro flights

Pasco to Ponta Delgada flights

Other flights to Porto
Explore flights to Porto departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on juni 2, 2024.

Top 8 airlines flying from Seattle to Porto

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$544	Average$725	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Delta	Cheapest$722	Average$1,080	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
KLM	Cheapest$755	Average$1,123	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Lufthansa	Cheapest$839	Average$1,162	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
British Airways	Cheapest$857	Average$1,147	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest$894	Average$1,333	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Turkish Airlines	Cheapest$914	Average$976	FlexibilityNo cancel fee	On-time77%	Search Turkish Airlines flights
Air France	Cheapest$1,116	Average$1,562	FlexibilityNo cancel fee	On-time77%	Search Air France flights

New York to Portugal flights

Los Angeles to Las Vegas flights

San Francisco to Shanghai flights

Fort Lauderdale to Los Angeles flights

Omaha to Chicago flights

New Jersey to Florida flights

San Francisco to New York flights

Fresno to Las Vegas flights

New York to London flights

Detroit to Miami flights

Boston to San Francisco flights

Seattle to Chicago O'Hare Intl Airport flights

Search flights from Seattle to Porto by cabin class

Book a flight to one of these trending destinations

Fly with Cheapflights

How does Cheapflights help users find flights from Seattle to Porto?

Deals for Seattle to Porto flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Porto?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Porto from Seattle.

Can Cheapflights find flights from Seattle to Porto with no change fees?

Yes, we can. To see specific flights from Seattle to Porto with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Porto become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Porto from Seattle today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

View all available airlines

Cheap flights from Seattle (SEA) to Porto (OPO) from $309

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.

The best prices from Seattle/Tacoma Intl to Porto are usually found in February or November, booked 16 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap flight deals from Seattle to Porto

Popular in

Cheapest in

Average price

Round-trip from

What is the cheapest day to fly round-trip from Seattle to Porto?

How far in advance should I book a flight from Seattle to Porto?

What is the cheapest month to fly from Seattle to Porto?

What is the cheapest time of day to fly from SEA to OPO?

Cheap Turkish Airlines flights from Seattle to Porto

Consider these cheap Turkish Airlines flights we've found departing from Seattle to Porto. Be sure to come back soon if the deals available don't appeal to you at this time.

Cheap KLM flights from Seattle to Porto

Explore cheap flight options specifically provided by KLM for the route between Seattle and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated juni 2, 2024.

Some of the best deals we've found on KLM flights traveling from Seattle to Porto. Ensure the flight price, dates, time, and airline match your criteria before you book.

Cheap Seattle to Porto flights in June & July 2024

Find cheap flight options from Seattle to Porto specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,810,401 searches. Prices were last updated on juni 2, 2024.

Listed are some of the best fares we've found on flights departing from Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.

Seattle to Porto 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Porto in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated juni 2, 2024.

Listed are some of the best fares we've found on flights departing from Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.

Seattle to Porto flights leaving soon

Consider one of these great deals we found on last-minute flights from Seattle to Porto. To prevent any unwanted surprises, users should verify their flight info before booking.

One-way flights to Porto from Seattle

Users in need of a one-way flight from Seattle to Porto can choose from these deals. Those needing a return flight from Seattle to Porto can use the search form above.

Find flights from Seattle to Porto within your budget

How far ahead should I book a flight from Seattle to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Porto. Price data was last updated on May 31, 2024.

Booking 16 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Porto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest day to fly from Seattle to Porto?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Porto. Price data was last updated on May 26, 2024.

Best time to book a flight from Seattle to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Seattle with our price prediction graph.

Temperature and rainfall in Porto by month

Plan your trip to Porto by taking into account the average temperature and rainfall totals by month.

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated juni 2, 2024.

To help decide which airline to fly from Seattle to Porto, see what other customers have to say about Turkish Airlines, KLM and United Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find flights from Seattle to Porto for under $700 on Cheapflights?

Are there last-minute flights available from Seattle to Porto for under $1,000?

What are the cheapest airlines flying from Seattle to Porto round-trip?

What are the cheapest airlines to fly from Seattle to Porto one-way?

What does SEA to OPO mean?

Can I find deals for flights from Seattle to Porto that include extra baggage allowance?

Can I find deals on flights from Seattle to Porto with specific airlines?

Can I find deals for flights from Seattle to Porto that include hotel bookings?

How can I find direct flights from Seattle to Porto?

Can I find deals for business class flights from Seattle to Porto?

Can I find deals for flights from Seattle to Porto that allow pets onboard?

Can I find deals on last-minute flights from Seattle to Porto?

How recently were the Seattle to Porto flight deals updated?

What are the most popular airlines that fly from Seattle to Porto?

What is the cheapest month to book a flight from Seattle to Porto?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to PortoSee prices for flight routes from nearby airports that may be better suited for you.

See prices for flight routes from nearby airports that may be better suited for you.

Top 8 airlines flying from Seattle to Porto

Popular flight searches

Check out other popular destinations found by fellow travelers in 2024

Search flights from Seattle to Porto by cabin class

Find flights from Seattle to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Porto?

Why should you use Cheapflights to find cheap flight tickets from Seattle to Porto?

Can Cheapflights find flights from Seattle to Porto with no change fees?

Can Cheapflights notify me if prices for flights from Seattle to Porto become cheaper?

100% Free

Book with Flexibility

Travel Smart

Alternative routes for Seattle to Porto
See prices for flight routes from nearby airports that may be better suited for you.