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$125+ Cheap flights from Boston to San Francisco (BOS - SFO)

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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
Oct 19 — Oct 261
Sun 10/19
Sun 10/26
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in January or March, booked 68 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from Boston to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 19, 2025.

Round-trip from

$221
(Priceline)

One-way from

$125
(Trip.com)

Popular in

December

Cheapest in

January

Average price

$337

Good round-trip deal

$278 or less

Good one-way deal

$170 or less
From Boston Logan Intl to San Francisco
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One-way flight from Boston Logan Intl to San Francisco
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Highest demand for flights based on searches. 1% potential increase in price ($5 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Boston Logan Intl to San Francisco.
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Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
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Find flight deals from Boston to San Francisco

Cheapest flights from Boston to San Francisco
Explore the most affordable flight options available from Boston to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 19, 2025.

This Priceline deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/109:55 amBOS - SFO
1 stop14h 16mFrontier
Fri 11/1410:23 pmSFO - BOS
1 stop9h 25mFrontier
Deal found 9/17$221
This CheapOair deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/811:43 amBOS - SFO
1 stop12h 28mFrontier
Sat 11/1510:23 pmSFO - BOS
1 stop31h 37mFrontier
Deal found 9/16$230
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3112:20 pmBOS - SFO
2 stops14h 54mFrontier
Fri 11/78:09 pmSFO - BOS
2 stops11h 39mFrontier
Deal found 9/15$235
This Kissandfly.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/268:23 pmBOS - SFO
Nonstop6h 29mAlaska Airlines
Sun 9/286:10 amSFO - BOS
Nonstop5h 50mAlaska Airlines
Deal found 9/17$246
This SmartFares deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/178:25 pmBOS - SFO
Nonstop6h 40mAlaska Airlines
Sat 10/257:11 amSFO - BOS
Nonstop5h 49mAlaska Airlines
Deal found 9/17$252
This Priceline deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/610:04 amBOS - SFO
1 stop14h 07mFrontier
Fri 11/710:23 pmSFO - BOS
1 stop9h 25mFrontier
Deal found 9/16$256
This SmartFares deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/317:10 amBOS - SFO
Nonstop6h 50mJetBlue
Fri 10/319:10 pmSFO - BOS
Nonstop5h 34mJetBlue
Deal found 9/15$257
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/111:43 amBOS - SFO
1 stop12h 28mFrontier
Wed 11/58:02 amSFO - BOS
2 stops21h 58mFrontier
Deal found 9/18$258
This KAYAK deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:59 pmBOS - SFO
Nonstop6h 51mAlaska Airlines
Sat 11/157:00 amSFO - BOS
Nonstop5h 41mAlaska Airlines
Deal found 9/18$261
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/111:43 amBOS - SFO
1 stop12h 28mFrontier
Fri 11/78:09 pmSFO - BOS
2 stops11h 39mFrontier
Deal found 9/18$262

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to San Francisco 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 2,558,603 searches. Data last updated September 19, 2025.
Use the filters below to find and compare flights from Boston to San Francisco that are best for you.

Fly from

Boston

Fly to

San Francisco

Route

Depart

Return

Price

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 12/3

8:14 pm-11:59 pm

Nonstop6h 45m

San Francisco

Tue 12/9

11:45 am-8:19 pm

Nonstop5h 34m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 11/26

8:30 pm-12:24 am

Nonstop6h 54m

San Francisco

Wed 12/3

10:55 pm-7:36 am

Nonstop5h 41m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 12/11

8:05 pm-11:58 pm

Nonstop6h 53m

San Francisco

Sun 12/14

9:43 pm-6:25 am

Nonstop5h 42m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 10/30

6:59 pm-10:50 pm

Nonstop6h 51m

San Francisco

Wed 11/5

7:00 am-3:41 pm

Nonstop5h 41m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 10/21

8:25 pm-12:05 am

Nonstop6h 40m

San Francisco

Tue 11/4

7:00 am-3:41 pm

Nonstop5h 41m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 11/6

8:07 pm-11:54 pm

Nonstop6h 47m

San Francisco

Mon 11/10

9:10 pm-5:44 am

Nonstop5h 34m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 10/7

7:15 am-11:02 am

Nonstop6h 47m

San Francisco

Tue 10/14

9:50 pm-6:30 am

Nonstop5h 40m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 11/11

7:00 am-10:50 am

Nonstop6h 50m

San Francisco

Wed 11/19

3:20 pm-11:51 pm

Nonstop5h 31m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 12/8

8:14 pm-11:59 pm

Nonstop6h 45m

San Francisco

Thu 1/8

7:55 am-4:25 pm

Nonstop5h 30m

$279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 11/1

7:55 pm-11:42 pm

Nonstop6h 47m

San Francisco

Sun 11/9

9:10 pm-5:44 am

Nonstop5h 34m

$279

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 24 results
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The best insider tips for Boston to San Francisco flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to San Francisco trip
Airlines
United Airlines

Basic Economy allows a personal item only; no carry-on bags unless exceptions apply.


United Economy Plus offers extra legroom seats at the front of the economy cabin.

Read more about United Airlinesby Harriet Baskas
Alaska Airlines

Alaska's Premium Class offers extra legroom and free cocktails, but snacks require purchase.


Saver Fare allows a carry-on bag, unlike many basic economy tickets.

Read more about Alaska Airlinesby Robert Schrader
Airports
BOS

Use the FlyLogan App for real-time flight updates and pre-order meals through BOS2GO for a quicker departure experience.

Read more about BOSby Paul Rubio
SFO

Travel from SFO to downtown San Francisco via BART for the least expensive option, taking about 40 minutes.

Read more about SFOby Harriet Baskas
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on United Airlines and SFO

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Paul Rubio

Paul Rubio

Expert on BOS

Paul Rubio

Paul Rubio

Travel journalist and photographer Paul Rubio is a Miami native (and current resident), who has lived in nine countries and traveled to 137. He is an expert in luxury travel, eco-travel, loyalty programs, hotels, airports and airlines. He is a contributing editor at AFAR, Condé Nast Traveler, LUXURY Magazine, and Palm Beach Illustrated.

Read more

Best time to book a flight from Boston to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Boston 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.

Cheapflights Insights

Everything you need to know about your flight from Boston to San Francisco

How far ahead should I book a flight from Boston to San Francisco?

Use this chart to determine the optimal time to book a round-trip flight from Boston to San Francisco. Price data was last updated on September 12, 2025.

To ensure you get the cheapest price possible for a flight from Boston to San Francisco, you should look to book at least 68 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Boston to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Boston to San Francisco (average of $276). Flying from Boston to San Francisco in June is currently the most expensive (average of $357). 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 is the cheapest time of day to fly from BOS to SFO?

Find hourly flight availability from Boston to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 19, 2025.

It’s typically best to fly out from Boston to San Francisco in the evening. Doing so could potentially save you 38% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Boston to San Francisco?

Use this chart to determine the cheapest time to fly round-trip from Boston to San Francisco. Price data was last updated on September 14, 2025.

Travelers seeking maximum savings on their Boston to San Francisco flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 San Francisco. Reviews last updated September 19, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and United Airlines from Boston to San Francisco to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
8.0
Very good
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,926 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
JetBlue
7.2
Good
2,911 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

Related info for your journey

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

  • What airports do I use to fly from Boston to San Francisco?

    If you book a flight from Boston to San Francisco, you will be flying from Logan Intl to San Francisco. Flights to San Francisco (SFO) from Boston Logan Intl (BOS) take 6h 29m for a nonstop flight. There are 47 flights from Logan Intl to San Francisco per day from 9 airlines.

  • How popular is this Boston to San Francisco flight route?

    Flights from Boston Logan Intl to San Francisco have been viewed 62 times in the past calendar month.

  • How long is the flight from Boston to San Francisco?

    For as low as $279, JetBlue can have you in San Francisco from Boston in 6h 45m. The distance between Boston and San Francisco is about 2696 mi. All flights are typically nonstop.

  • What are the cheapest airlines flying from Boston to San Francisco round-trip?

    According to our current data, Frontier ($84), Hawaiian Airlines ($129), and Sun Country Air ($150) offers the cheapest pricing from Boston to San Francisco. Frontier is currently priced 76% below the average price you’ll pay for this route.

  • What are the most reliable airlines from Boston to San Francisco?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Boston to San Francisco on time: Air China (88%), Icelandair (86%), Etihad Airways (84%).

  • What are the cheapest flights from Boston to San Francisco?

    On average you can expect to pay $772 for a flight from Boston to San Francisco. The cheapest flight overall is $118 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at $246.

  • Can I find deals for flights from Boston to San Francisco that include hotel bookings?

    Yes. In addition to deals on Boston to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to San Francisco?

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

  • Can I find deals for business class flights from Boston to San Francisco?

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

  • What is the cheapest month to book a flight from Boston to San Francisco?

    Currently, January is the cheapest month in which you can book a flight from Boston to San Francisco (average of $276). Flying from Boston to San Francisco in June is currently the most expensive (average of $357). 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

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Santa Cruz
Livermore
South San Francisco
Turlock
Antioch
Watsonville
Santa Clara
Manteca
Sunnyvale
Hollister
Vacaville
Foster City
Union City
Vallejo
Burlingame
Redwood City
San Mateo
San Leandro
Lathrop

Browse thousands of different options on Cheapflights for your next trip

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Top 9 airlines flying from Boston to San Francisco

Discover the top 9 airlines that operate flights from Boston to San Francisco. 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 2,558,603 searches. Data last updated September 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$208FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$129Average$321FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$150Average$315FlexibilityNo cancel feeOn-time83%
SouthwestCheapest$153Average$367FlexibilityNo cancel feeOn-time63%
DeltaCheapest$181Average$363FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$197Average$353FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$227Average$411FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$229Average$376FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$239Average$420FlexibilityNo cancel feeOn-time71%

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