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$119+ 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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
May 3 — May 101
Sat 5/3
Sat 5/10
1 adult, Economy
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Find cheap flights from Boston to San Francisco with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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3. Compare prices and book

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Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in September or January, booked 56 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 April 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$227
(Kiwi.com)

One-way from

$119
(Alaska Airlines)

Popular in

June

Cheapest in

September

Average price

$387

Good round-trip deal

$306 or less

Good one-way deal

$166 or less
Provider with most accurate pricing for Boston Logan Intl-San Francisco flight deals.
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Provider most trusted by Cheapflights users for Boston Logan Intl-San Francisco flights.
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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. 6% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Fri 5/912:52 pmBOS - SFO
1 stop12h 30mFrontier
Mon 5/129:59 pmSFO - BOS
1 stop23h 45mFrontier
Deal found 4/28$227
This Orbitz deal was found by Cheapflights users on 4/27. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/297:00 amBOS - SFO
Nonstop6h 49mMultiple Airlines
Tue 6/310:19 pmSFO - BOS
1 stop9h 01mMultiple Airlines
Deal found 4/27$234
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 6/38:40 amBOS - SFO
1 stop8h 39mHawaiian Airlines
Tue 6/108:47 pmSFO - BOS
Nonstop5h 53mHawaiian Airlines
Deal found 4/28$246
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/294:55 pmBOS - SFO
Nonstop6h 45mDelta
Tue 6/37:00 amSFO - BOS
Nonstop5h 45mDelta
Deal found 4/27$248
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/37:30 amBOS - SFO
1 stop9h 13mAlaska Airlines
Tue 6/1011:30 amSFO - BOS
1 stop9h 36mAlaska Airlines
Deal found 4/28$256
This American Airlines deal was found by Cheapflights users on 4/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/219:10 amBOS - SFO
1 stop9h 53mAmerican Airlines
Tue 5/2710:00 pmSFO - BOS
1 stop8h 20mAmerican Airlines
Deal found 4/28$257
This JetBlue deal was found by Cheapflights users on 4/28. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/248:34 amBOS - SFO
Nonstop6h 41mJetBlue
Fri 5/3010:45 pmSFO - BOS
1 stop7h 40mJetBlue
Deal found 4/28$266
This United Airlines deal was found by Cheapflights users on 4/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/310:32 amBOS - SFO
Nonstop6h 31mUnited Airlines
Sun 7/611:55 pmSFO - BOS
1 stop8h 04mUnited Airlines
Deal found 4/28$269
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/125:20 amBOS - SFO
2 stops9h 50mSouthwest
Thu 8/2111:25 amSFO - BOS
1 stop8h 35mSouthwest
Deal found 4/28$324

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 April 28, 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

Fri 5/9

12:52 pm-10:22 pm

1 stop12h 30m

San Francisco

Mon 5/12

9:59 pm-12:44 am

1 stop23h 45m

$227

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 5/29

7:00 am-10:49 am

Nonstop6h 49m

San Francisco

Tue 6/3

10:19 pm-10:20 am

1 stop9h 01m

$234

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 6/3

8:40 am-2:19 pm

1 stop8h 39m

San Francisco

Tue 6/10

8:47 pm-5:40 am

Nonstop5h 53m

$246

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 5/29

4:55 pm-8:40 pm

Nonstop6h 45m

San Francisco

Tue 6/3

7:00 am-3:45 pm

Nonstop5h 45m

$248

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 6/3

7:30 am-3:51 pm

1 stop11h 21m

San Francisco

Sat 6/7

6:55 pm-7:20 am

1 stop9h 25m

$256

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 5/21

9:10 am-4:03 pm

1 stop9h 53m

San Francisco

Tue 5/27

10:00 pm-9:20 am

1 stop8h 20m

$257

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 5/24

8:34 am-12:15 pm

Nonstop6h 41m

San Francisco

Fri 5/30

10:45 pm-9:25 am

1 stop7h 40m

$266

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 7/3

10:32 am-2:03 pm

Nonstop6h 31m

San Francisco

Sun 7/6

11:55 pm-10:59 am

1 stop8h 04m

$269

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 7/18

6:45 pm-12:10 am

1 stop8h 25m

San Francisco

Tue 7/22

5:55 pm-7:55 am

2 stops11h 00m

$339

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 6/3

7:59 pm-11:44 pm

Nonstop6h 45m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 19 results
1
2

Compare providers for flights from Boston to San Francisco

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to San Francisco in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-San Francisco flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 to pre-order meals and save time at BOS. Most restaurants participate, making it a convenient option.

Read more about BOSby Paul Rubio
SFO

Take BART from SFO to downtown San Francisco for the least expensive travel option. The trip takes 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 April 25, 2025.

To ensure you get the cheapest price possible for a flight from Boston to San Francisco, you should look to book at least 56 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 $393). 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 April 28, 2025.

It’s typically best to fly out from Boston to San Francisco in the evening. Doing so could potentially save you 43% 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 March 30, 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.

Weekly flight availability from Boston to San Francisco

Explore weekly flight availability from Boston to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 28, 2025.

The most flights from BOS to SFO are scheduled on a Monday (49 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 on average).

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

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).

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 April 28, 2025.
To help decide which airline to fly from Boston to San Francisco, see what other customers have to say about Alaska Airlines, Southwest and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,292 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,401 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 28m for a nonstop flight. There are 39 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 70 times in the past calendar month.

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

    According to our current data, Frontier ($227), Hawaiian Airlines ($232), and Alaska Airlines ($247) offers the cheapest pricing from Boston to San Francisco. Frontier is currently priced 36% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Boston to San Francisco one-way?

    One-way options have recently been found by users for as low as $119 on Alaska Airlines. Other airlines that offer cheap prices include Hawaiian Airlines from $121 and Frontier from $123 one-way.

  • 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 (95%), Scandinavian Airlines (91%), Delta (87%).

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

    On average you can expect to pay $1,029 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 $231.

  • 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 $393). 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 Boston?

Book flights to Boston if you plan to visit one of these locations
Roseville
Mountain View
Santa Cruz
Turlock
Livermore
South San Francisco
Fairfield
Manteca
Richmond
Watsonville
Hollister
Milpitas
Antioch
Sausalito
Vallejo
Newark
Hayward
Alameda
Sunnyvale
Campbell

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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 April 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$84Average$198FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$384FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$134Average$323FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$150Average$333FlexibilityNo cancel feeOn-time83%
DeltaCheapest$163Average$365FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$195Average$354FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$210Average$387FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$227Average$415FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$288Average$386FlexibilityNo cancel feeOn-time63%

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