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Cheap flights from St. Louis (STL) to Ontario from $127

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 7/30. 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.
STL — YYZ
Jun 7 — Jun 141
From?
To?
Fri 6/7
Fri 6/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

How far in advance should I book a flight from St. Louis to Region of Ontario?

To save on the cost of your flight from St. Louis to Region of Ontario, book at least 24 days before your planned departure. Booking around this time can save you about 128% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $259 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $473.

What is the cheapest month to fly from St. Louis to Region of Ontario?

March is one of the best times of the year to fly to Region of Ontario from St. Louis. Prices for March average $359 per person but you can even find prices for as low as $176. The most expensive prices can be found in the month of February. Opting for a March flight can save you 82% on your journey compared to booking in February

What is the cheapest time of day to fly from STL to ON?

When flying from St. Louis to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Cheap American Airlines flights from St. Louis to Ontario

Explore cheap flight options specifically provided by American Airlines for the route between St. Louis and Ontario. 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 June 2, 2024.
Check out some of the cheapest American Airlines flights we've come across from St. Louis to Ontario. It's recommended that users confirm their flight details before booking.
Thu 7/46:09 amSTL - YUL
2 stops9h 21mAmerican Airlines
Tue 7/97:29 amYUL - STL
1 stop7h 45mAmerican Airlines
Deal found 5/31$545
Thu 7/187:03 amSTL - YYZ
1 stop6h 56mAmerican Airlines
Mon 7/227:23 pmYYZ - STL
1 stop5h 31mAmerican Airlines
Deal found 5/31$555
Wed 7/36:09 amSTL - YUL
2 stops9h 21mAmerican Airlines
Mon 7/85:23 pmYUL - STL
1 stop16h 16mAmerican Airlines
Deal found 5/31$573
Wed 7/37:00 amSTL - YUL
1 stop14h 44mAmerican Airlines
Mon 7/85:23 pmYUL - STL
1 stop16h 16mAmerican Airlines
Deal found 5/31$589
Tue 8/66:32 amSTL - YYZ
1 stop26h 17mAmerican Airlines
Wed 8/712:41 pmYYZ - STL
2 stops20h 46mAmerican Airlines
Deal found 6/1$654

Cheap Delta flights from St. Louis to Ontario

Explore cheap flight options specifically provided by Delta for the route between St. Louis and Ontario. 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 June 2, 2024.
Take a gander at the lowest prices we've found on Delta flights from St. Louis to Ontario. Check back soon if you're not seeing flights that suit your needs.
Wed 8/2812:59 pmSTL - YUL
1 stop9h 11mDelta
Wed 9/410:00 amYUL - STL
1 stop9h 30mDelta
Deal found 5/31$441
Wed 8/2812:59 pmSTL - YUL
1 stop9h 11mDelta
Wed 9/46:14 amYUL - STL
2 stops11h 06mDelta
Deal found 5/31$450
Sat 7/276:06 amSTL - YYZ
1 stop4h 33mDelta
Tue 7/306:30 amYYZ - STL
1 stop8h 49mDelta
Deal found 6/1$500
Thu 11/76:00 amSTL - YYZ
1 stop8h 41mDelta
Sat 11/96:30 amYYZ - STL
2 stops11h 04mDelta
Deal found 5/31$501
Thu 11/710:10 amSTL - YYZ
2 stops11h 38mDelta
Sat 11/96:30 amYYZ - STL
2 stops11h 04mDelta
Deal found 5/31$525
Tue 7/1612:59 pmSTL - YYZ
1 stop8h 50mDelta
Sat 7/207:44 amYYZ - STL
1 stop4h 58mDelta
Deal found 6/1$542
Sat 7/133:49 pmSTL - YYZ
1 stop7h 08mDelta
Fri 7/1910:16 amYYZ - STL
1 stop9h 14mDelta
Deal found 6/1$550

Cheap St. Louis to Ontario flights in June & July 2024

Find cheap flight options from St. Louis to Ontario 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 June 2, 2024.
These are some of the most attractive deals on flights from St. Louis to Ontario in 2024. Check back regularly for other flight deals.
Sat 6/811:34 amSTL - YYZ
1 stop11h 28mMultiple Airlines
Mon 6/104:15 pmYYZ - STL
1 stop15h 52mMultiple Airlines
Deal found 6/1$280
Sat 6/811:34 amSTL - YYZ
1 stop10h 52mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
2 stops19h 57mMultiple Airlines
Deal found 6/1$315
Thu 6/278:12 pmSTL - YYZ
1 stop16h 16mMultiple Airlines
Mon 7/14:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/2$356
Thu 6/278:12 pmSTL - YYZ
1 stop16h 16mMultiple Airlines
Mon 7/14:00 pmYYZ - STL
2 stops19h 57mMultiple Airlines
Deal found 6/2$368
Sat 6/811:34 amSTL - YYZ
1 stop10h 52mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/1$375
Thu 6/276:22 pmSTL - YYZ
2 stops28h 04mMultiple Airlines
Mon 7/14:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/2$376
Sun 6/211:22 pmSTL - YYZ
2 stops22h 25mMultiple Airlines
Sun 6/98:20 pmYYZ - STL
1 stop18h 31mMultiple Airlines
Deal found 5/31$380
Sun 6/27:44 pmSTL - YYZ
1 stop26h 42mMultiple Airlines
Sun 6/98:20 pmYYZ - STL
1 stop18h 31mMultiple Airlines
Deal found 5/31$385
Sat 6/812:45 pmSTL - YYZ
3 stops20h 08mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
2 stops19h 57mMultiple Airlines
Deal found 6/1$394

St. Louis to Ontario 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated June 2, 2024.
These are some of the most attractive deals on flights from St. Louis to Ontario in 2024. Check back regularly for other flight deals.
Sat 6/811:34 amSTL - YYZ
1 stop11h 28mMultiple Airlines
Mon 6/104:15 pmYYZ - STL
1 stop15h 52mMultiple Airlines
Deal found 6/1$280
Sat 6/811:34 amSTL - YYZ
1 stop10h 52mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
2 stops19h 57mMultiple Airlines
Deal found 6/1$315
Thu 6/278:12 pmSTL - YYZ
1 stop16h 16mMultiple Airlines
Mon 7/14:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/2$356
Tue 8/67:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Wed 8/71:55 pmYYZ - STL
1 stop28h 34mMultiple Airlines
Deal found 6/1$364
Thu 6/278:12 pmSTL - YYZ
1 stop16h 16mMultiple Airlines
Mon 7/14:00 pmYYZ - STL
2 stops19h 57mMultiple Airlines
Deal found 6/2$368
Sat 6/811:34 amSTL - YYZ
1 stop10h 52mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/1$375
Thu 6/276:22 pmSTL - YYZ
2 stops28h 04mMultiple Airlines
Mon 7/14:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/2$376
Sun 6/211:22 pmSTL - YYZ
2 stops22h 25mMultiple Airlines
Sun 6/98:20 pmYYZ - STL
1 stop18h 31mMultiple Airlines
Deal found 5/31$380
Sun 6/27:44 pmSTL - YYZ
1 stop26h 42mMultiple Airlines
Sun 6/98:20 pmYYZ - STL
1 stop18h 31mMultiple Airlines
Deal found 5/31$385

Non-stop flights to Ontario from St. Louis

Discover non-stop flight options from St. Louis to Ontario. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated June 2, 2024.
If you're seeking options on non-stop flights from St. Louis to Ontario, check out these fares. If you're looking for other options for flights from St. Louis to Ontario, make sure to update the search form at the top of page.
Wed 8/2812:00 pmSTL - YUL
Nonstop2h 23mAir Canada
Wed 9/47:30 pmYUL - STL
Nonstop2h 35mAir Canada
Deal found 5/31$512
Sat 7/134:05 pmSTL - YYZ
Nonstop1h 59mUnited Airlines
Sun 7/146:55 pmYYZ - STL
Nonstop2h 06mUnited Airlines
Deal found 6/1$533
Mon 7/14:05 pmSTL - YYZ
Nonstop1h 59mMultiple Airlines
Mon 7/86:55 pmYYZ - STL
Nonstop2h 06mMultiple Airlines
Deal found 6/1$554
Fri 8/1610:10 amSTL - YYZ
Nonstop1h 59mAir Canada
Fri 8/232:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 6/1$574
Sat 7/611:30 amSTL - YUL
Nonstop2h 23mAir Canada
Fri 7/127:30 pmYUL - STL
Nonstop2h 35mAir Canada
Deal found 6/1$602
Fri 7/511:30 amSTL - YUL
Nonstop2h 23mUnited Airlines
Wed 7/107:30 pmYUL - STL
Nonstop2h 35mUnited Airlines
Deal found 5/31$612
Sat 7/1311:30 amSTL - YUL
Nonstop2h 23mAir Canada
Sat 8/177:30 pmYUL - STL
Nonstop2h 35mAir Canada
Deal found 6/1$627
Tue 7/1610:10 amSTL - YYZ
Nonstop1h 59mAir Canada
Sat 7/206:55 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 6/1$629
Thu 7/1810:10 amSTL - YYZ
Nonstop1h 59mAir Canada
Mon 7/222:15 pmYYZ - STL
Nonstop2h 06mAir Canada
Deal found 5/31$649

St. Louis to Ontario flights leaving soon

Find last-minute flight options from St. Louis to Ontario for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated June 2, 2024.
Book one of these great deals on flights from St. Louis to Ontario. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Sat 6/811:34 amSTL - YYZ
1 stop11h 28mMultiple Airlines
Mon 6/104:15 pmYYZ - STL
1 stop15h 52mMultiple Airlines
Deal found 6/1$280
Sat 6/811:34 amSTL - YYZ
1 stop10h 52mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
2 stops19h 57mMultiple Airlines
Deal found 6/1$315
Sat 6/811:34 amSTL - YYZ
1 stop10h 52mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/1$375
Sat 6/812:45 pmSTL - YYZ
3 stops20h 08mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
2 stops19h 57mMultiple Airlines
Deal found 6/1$394
Sat 6/812:45 pmSTL - YYZ
3 stops20h 08mMultiple Airlines
Mon 6/104:00 pmYYZ - STL
3 stops23h 23mMultiple Airlines
Deal found 6/1$454
Tue 6/113:23 pmSTL - YUL
3 stops19h 52mMultiple Airlines
Wed 6/124:45 pmYUL - STL
3 stops28h 10mMultiple Airlines
Deal found 6/1$592
Tue 6/114:02 pmSTL - YUL
1 stop6h 53mWestJet
Wed 6/126:47 pmYUL - STL
1 stop5h 56mWestJet
Deal found 6/1$891
Tue 6/116:08 amSTL - YUL
1 stop14h 58mMultiple Airlines
Wed 6/127:30 pmYUL - STL
Nonstop2h 35mMultiple Airlines
Deal found 6/1$900
Tue 6/1111:25 amSTL - YUL
1 stop23h 30mWestJet
Wed 6/122:20 pmYUL - STL
2 stops27h 41mWestJet
Deal found 6/1$949

One-way flights to Ontario from St. Louis

Search for one-way flight options from St. Louis to Ontario. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated June 2, 2024.
Users traveling one-way from St. Louis to Ontario can select one of these great deals. Users in need of a round-trip flight from St. Louis to Ontario instead should update the search form at the top of page.
Tue 7/3010:11 amSTL - YYZ
1 stop10h 14mMultiple Airlines
Deal found 6/2$127
Mon 6/176:16 pmSTL - YYZ
1 stop19h 12mMultiple Airlines
Deal found 5/31$139
Wed 7/177:33 pmSTL - YYZ
1 stop27h 01mMultiple Airlines
Deal found 6/1$157
Thu 9/56:18 pmSTL - YYZ
1 stop11h 25mMultiple Airlines
Deal found 6/1$171
Thu 9/56:24 pmSTL - YYZ
2 stops25h 36mMultiple Airlines
Deal found 6/1$172
Tue 7/307:45 amSTL - YYZ
2 stops12h 15mMultiple Airlines
Deal found 6/2$178
Wed 7/174:02 pmSTL - YYZ
3 stops24h 30mMultiple Airlines
Deal found 6/1$181
Mon 6/172:41 pmSTL - YYZ
3 stops29h 44mMultiple Airlines
Deal found 5/31$188
Tue 8/1310:11 amSTL - YUL
2 stops13h 20mMultiple Airlines
Deal found 6/1$192

Find flights from St. Louis to Ontario within your budget

Customize your flight search to find flights from St. Louis to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated June 2, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$356 - $608

Route

Depart

Return

Price

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 6/27

1 stop16h 16m

Toronto Pearson Intl

Mon 7/1

3 stops23h 23m

$356

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 8/6

2 stops12h 15m

Toronto Pearson Intl

Wed 8/7

1 stop28h 34m

$364

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 6/27

1 stop16h 16m

Toronto Pearson Intl

Mon 7/1

2 stops19h 57m

$368

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Wed 8/28

1 stop9h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 9/4

1 stop9h 30m

$441

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Wed 8/28

1 stop9h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 9/4

2 stops11h 06m

$450

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Wed 8/28

Nonstop2h 23m

Montreal Pierre Elliott Trudeau Intl

Wed 9/4

Nonstop2h 35m

$512

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 9/4

1 stop13h 28m

Toronto Pearson Intl

Mon 9/16

1 stop26h 07m

$528

Lambert-St LouisMontreal Pierre Elliott Trudeau Intl

STL - YUL

STLYUL

Lambert-St Louis

Thu 7/4

2 stops9h 21m

Montreal Pierre Elliott Trudeau Intl

Tue 7/9

1 stop7h 45m

$545

Lambert-St LouisToronto Pearson Intl

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 9/4

2 stops15h 28m

Toronto Pearson Intl

Mon 9/16

2 stops16h 43m

$608

Flights are sorted by cheapest first

Deals found on 6/2

No data available for this route at this time. Please check back soon.

Best time to book a flight from St. Louis to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated June 2, 2024.
Peruse reviews from past customers who have flown with American Airlines, Delta and Air Canada from St. Louis to Ontario to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,198 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.3

Comfort

7.9

Overall

8.1

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Alaska Airlines
8.1
Very good
9,198 reviews
Alaska Airlines
8.1
Very good
9,198 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.3

Comfort

7.9

Overall

8.1

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Delta
8.0
Very good
10,410 reviews
Alaska Airlines
8.1
Very good
9,198 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.3

Comfort

7.9

Overall

8.1

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

WestJet
7.5
Good
2,861 reviews
Alaska Airlines
8.1
Very good
9,198 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.3

Comfort

7.9

Overall

8.1

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

United Airlines
7.4
Good
10,755 reviews
Alaska Airlines
8.1
Very good
9,198 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.3

Comfort

7.9

Overall

8.1

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

American Airlines
7.3
Good
14,260 reviews
Alaska Airlines
8.1
Very good
9,198 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.3

Comfort

7.9

Overall

8.1

Crew

8.6

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Related info for your journey

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

  • What airport do you fly from for flights from St. Louis to Ontario?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to Ontario. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • Can I find flights from St. Louis to Region of Ontario for under $400 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Region of Ontario for under $400. The cheapest flight booked recently is on Multiple Airlines for just $356, but on average you can expect to pay $418.

  • Are there nonstop flights from St. Louis to Region of Ontario for under $600 on Cheapflights?

    Cheapflights has at least 20 direct flights from St. Louis to Region of Ontario under $600. A good price for a nonstop flight from St. Louis to Region of Ontario is less than $647.

  • Are there last-minute flights available from St. Louis to Region of Ontario for under $300?

    There are currently 11+ open flights from St. Louis to Region of Ontario within the next 7 days for less than $300.

  • What are the cheapest airlines to fly from St. Louis to Region of Ontario one-way?

    One-way options have recently been found by users for as low as $234 on Delta. Other airlines that offer cheap prices include United Airlines from $242 and American Airlines from $243 one-way.

  • What are the most popular routes from St. Louis to Region of Ontario?

    When deciding which route to take from St. Louis to Region of Ontario consider Lambert-St Louis - Toronto Pearson Intl, Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl or Lambert-St Louis - Ottawa as they are the most popular.

  • What are the most reliable airlines from St. Louis to Region of Ontario?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Region of Ontario consider choosing United Airlines (84%), Air Canada (82%) or Jazz (82%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Region of Ontario?

    Looking for the cheapest flight from St. Louis to Region of Ontario? While on average our users pay $1,838, our data indicates the cheapest price to be $242. The most popular route (Lambert-St Louis - Toronto Pearson Intl), is priced around $327.

  • What does STL to YYZ mean?

    Great question - STL to YYZ just means Lambert-St Louis Airport to Toronto Pearson Intl Airport. Now you’ll know what these unique codes when you look for flights! This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Ottawa Airport (YOW), Hamilton Airport (YHM), Toronto Island Airport (YTZ), Toronto Kitchener-Waterloo Airport (YKF), London Airport (YXU).

  • Can I find deals for flights from St. Louis to Ontario that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Ontario 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 St. Louis to Ontario with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Ontario 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 St. Louis to Ontario that include hotel bookings?

    Yes. In addition to deals on St. Louis to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Ontario?

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

  • Can I find deals for business class flights from St. Louis to Ontario?

    Yes. Cheapflights offers flight deals from St. Louis to Ontario 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 St. Louis to Ontario that allow pets onboard?

    Many airlines flying from St. Louis to Ontario 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 St. Louis to Ontario?

    Yes, you can often find last-minute deals on St. Louis to Ontario 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 St. Louis to Region of Ontario flight deals updated?

    The St. Louis to Region of Ontario flight deals you see on this page were last updated on 6/2.

  • What are the most popular airlines that fly from St. Louis to Region of Ontario?

    American Airlines, Air Canada and United Airlines are the most popular airlines when flying from St. Louis to Region of Ontario.

  • What is the cheapest month to book a flight from St. Louis to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Region of Ontario (average of $237). Flying from St. Louis to Region of Ontario in July is currently the most expensive (average of $391). 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

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Alternative routes for St. Louis to Ontario
See prices for flight routes from nearby airports that may be better suited for you.

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Top 3 airlines flying from St. Louis to Ontario

Discover the top 3 airlines that operate flights from St. Louis to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated June 2, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$188Average$446FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$225Average$680FlexibilityNo cancel feeOn-time69%
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Search flights from St. Louis to Ontario by cabin class

Find flights from St. Louis to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from St. Louis to Ontario

Find hourly flight availability from St. Louis to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 2, 2024.
0%of flight departuresEarly morningMidnight to 6 am
50%of flight departuresMorning6 am to noon
50%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
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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 St. Louis to Ontario?

Cheapflights makes it easy to find St. Louis to Ontario flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Ontario?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to Ontario for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to Ontario with no change fees?

Need flexible booking options for your flight to Ontario from St. Louis? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Ontario become cheaper?

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

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