Currently, the most affordable month to book a United Airlines flight from Boston to San Francisco in December, with an average price of $267. Conversely, traveling with United Airlines from Boston to San Francisco in June will be the most expensive, with an average cost of $382. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
January
$274
February
$281
March
$330
April
$296
May
$316
June
$382
July
$364
August
$298
September
$268
October
$268
November
$287
December
$267
SFO Temperature | 51.8 - 62.6 °F |
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If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).
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