Compare Cheap Flights from Boston to San Francisco
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Round Trip Flights from Boston to San Francisco
Last updated on Wednesday 04/29/2026 at 05:00 AM, the fares mentioned above are for flight tickets and inclusive of fuel surcharges, service fee and taxes. Based on historical data, these fares are subject to change without prior notice and cannot be guaranteed at the time of booking. Kindly go through our terms and conditions before booking.
Book Boston To San Francisco Flights
The city of Karl the Fog, the Golden Gate Bridge, and America's oldest Chinatown, San Francisco, is full of entertainment and amusements. While the iconic architecture speaks for the city's infrastructure advancement, some attractions glorify the history. San Francisco has played a major role in framing American history, be it the Summer of Love in the 1960s or the Gay Liberation and Gay Rights movement. But what attracts tourists is the magnificence of this city.
Alcatraz is one of the most thrilling places you can visit. This island in San Francisco was once a prison for the most dangerous criminals in the country. Today, it has become a center for attraction where one can explore the cell blocks and mess hall and learn about its history. Historic Presidio is another attraction that served as a former military base. It is now a national park, with highlights like The Walt Disney Family Museum, Disney artifacts, The Tunnel Tops, and more. There is no dearth of activities and adventures, as travelers can enjoy a cable car ride, attend an outdoor festival, experience the San Francisco Bay cruises, and much more.
Reaching San Francisco is relatively easy, as there are three airports: San Francisco International Airport (SFO/KSFO), Norman Y. Mineta San José International Airport (KSJC), and Oakland International Airport?(KOAK). You can consider traveling during the shoulder season to book a cheap flight from Boston to San Francisco. Spring, starting from April to May, or fall, starting from September to November, is the time when you can easily find cheap Boston to San Francisco flight tickets. With Packedbag, compare airfares and book cheap BOS to SFO flights.
Finding Cheap Flights From Boston To San Francisco : Frequently Asked Questions
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How much are round-trip flights from Boston to San Francisco?
Average cost of a round-trip flight from Boston to San Francisco is around $497.
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Which upcoming date is cheapest to fly from Boston to San Francisco?
In the next 90 days, flights from Boston to San Francisco on will be the cheapest on May 16, 2026, May 23, 2026, and May 23, 2026.
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What?s the cheapest day of the week to fly from Boston to San Francisco?
On an average, flights from Boston to San Francisco tend to be cheapest on Monday.
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Which airlines offers the cheapest fares from Boston to San Francisco?
At the moment, FRONTIER AIRLINES and AMERICAN AIRLINES offer the cheapest flights from Boston to San Francisco.
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When is the peak season for traveling from Boston to San Francisco?
May to July is the peak season to travel from Boston to San Francisco.
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Cheapest Months to fly to San Francisco
The cheapest months to visit San Francisco are from May through July.
* The mentioned flight facts are based on the last 3 months' data. Information regarding the highest and lowest booking months is based on the last 12 months' data.
Major Carriers Operating Flights From Boston To San Francisco
UNITED AIRLINES
$203
$473
ALASKA AIRLINES
$186
$480
AMERICAN AIRLINES
$158
$377
Low Cost Carriers Operating Flights From Boston To San Francisco
FRONTIER AIRLINES
$148
$374
AMERICAN AIRLINES
$158
$377
ALASKA AIRLINES
$186
$480
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