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$141+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
Apr 29 — May 61
Wed 4/29
Wed 5/6
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”

2. Select your favorite providers

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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 90 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap 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 March 30, 2026.

This flugladen.de deal was found by Cheapflights users on 3/28. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:00 am
BOS
-
SFO
1 stop14h 34m
Multiple Airlines
Wed 4/292:00 pm
SFO
-
BOS
Nonstop5h 45m
Multiple Airlines
Deal found 3/28$263
This CheapOair deal was found by Cheapflights users on 3/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:00 am
BOS
-
SFO
1 stop14h 34m
Multiple Airlines
Tue 5/58:45 pm
SFO
-
BOS
Nonstop5h 42m
Multiple Airlines
Deal found 3/27$264
This Frontier deal was found by Cheapflights users on 3/25. 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.
Wed 4/85:45 am
BOS
-
SFO
1 stop16h 34m
Frontier
Sun 4/1210:23 pm
SFO
-
BOS
1 stop10h 22m
Frontier
Deal found 3/25$265
This CheapOair deal was found by Cheapflights users on 3/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:15 pm
BOS
-
SFO
Nonstop6h 49m
Multiple Airlines
Sat 4/1810:38 pm
SFO
-
BOS
1 stop9h 22m
Multiple Airlines
Deal found 3/28$266
This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:12 am
BOS
-
SFO
1 stop13h 22m
Multiple Airlines
Mon 5/115:31 pm
SFO
-
BOS
1 stop10h 41m
Multiple Airlines
Deal found 3/28$267
This SmartFares deal was found by Cheapflights users on 3/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:19 pm
BOS
-
SFO
Nonstop6h 40m
JetBlue
Wed 4/298:45 pm
SFO
-
BOS
Nonstop5h 42m
JetBlue
Deal found 3/28$268
This Expedia deal was found by Cheapflights users on 3/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 am
BOS
-
SFO
1 stop14h 34m
Multiple Airlines
Wed 4/227:00 am
SFO
-
BOS
Nonstop5h 37m
Multiple Airlines
Deal found 3/27$269
This Frontier deal was found by Cheapflights users on 3/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:00 am
BOS
-
SFO
1 stop14h 34m
Frontier
Thu 4/3010:38 pm
SFO
-
BOS
1 stop10h 09m
Frontier
Deal found 3/27$270
This Frontier deal was found by Cheapflights users on 3/26. 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.
Sat 4/256:00 am
BOS
-
SFO
1 stop14h 34m
Frontier
Sat 5/210:38 pm
SFO
-
BOS
1 stop9h 47m
Frontier
Deal found 3/26$271
This Frontier deal was found by Cheapflights users on 3/26. 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.
Thu 4/25:30 am
BOS
-
SFO
1 stop16h 44m
Frontier
Sat 5/210:38 pm
SFO
-
BOS
1 stop9h 47m
Frontier
Deal found 3/26$272
This Expedia deal was found by Cheapflights users on 3/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:00 am
BOS
-
SFO
1 stop14h 34m
Multiple Airlines
Sat 5/27:59 pm
SFO
-
BOS
1 stop16h 34m
Multiple Airlines
Deal found 3/29$273
This CheapOair deal was found by Cheapflights users on 3/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/812:01 pm
BOS
-
SFO
1 stop10h 33m
Multiple Airlines
Sun 5/108:44 pm
SFO
-
BOS
Nonstop5h 44m
Multiple Airlines
Deal found 3/27$274

Find 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 March 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$263
(flugladen.de)

One-way from

$141
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$392

Good round-trip deal

$353 or less

Good one-way deal

$189 or less
Provider with most accurate pricing for Boston Logan Intl-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-San Francisco flights.
Search Deals
From Boston Logan Intl to San Francisco
Search Deals
One-way flight from Boston Logan Intl to San Francisco
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($3 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Boston Logan Intl to San Francisco.
Search Deals
Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
Search Deals

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 March 30, 2026.
Use the filters below to find and compare flights from Boston to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 4/29

11:40 am-7:55 pm

2 stops11h 15m

San Francisco

Mon 5/4

9:15 pm-9:45 am

1 stop9h 30m

$280

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 5/1

2:30 pm-11:20 pm

1 stop11h 50m

San Francisco

Wed 5/6

7:15 pm-8:05 am

2 stops9h 50m

$289

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 6/3

2:25 pm-11:15 pm

2 stops11h 50m

San Francisco

Sun 6/7

6:00 am-11:00 pm

1 stop14h 00m

$294
Quickest round-trip

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 5/1

8:19 pm-11:59 pm

Nonstop6h 40m

San Francisco

Mon 5/4

8:45 pm-5:27 am

Nonstop5h 42m

$297

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 5/7

2:30 pm-11:20 pm

1 stop11h 50m

San Francisco

Sat 5/9

12:45 pm-11:50 pm

1 stop8h 05m

$300

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 5/12

4:52 pm-10:42 pm

1 stop8h 50m

San Francisco

Sat 5/16

11:20 pm-8:23 am

Nonstop6h 03m

$307

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 8/25

7:00 am-10:57 am

Nonstop6h 57m

San Francisco

Sun 8/30

10:00 pm-6:54 am

Nonstop5h 54m

$327

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 9/25

5:45 pm-11:39 pm

1 stop8h 54m

San Francisco

Mon 9/28

8:00 am-7:31 am

1 stop20h 31m

$343

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 6/9

11:35 am-7:50 pm

1 stop11h 15m

San Francisco

Mon 6/15

6:10 pm-8:00 am

2 stops10h 50m

$382

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 5/25

6:40 pm-5:01 pm

1 stop25h 21m

San Francisco

Tue 6/9

4:44 pm-5:44 am

1 stop10h 00m

$402

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 23 resultsSorted by cheapest first
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3

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
OvagoPrice Accuracy2 starsTrust Score*3 stars
Super.comPrice Accuracy-Trust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 FlightHub the most. FlightHub 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.

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 March 13, 2026.

To ensure you get the cheapest price possible for a flight from Boston to San Francisco, you should look to book at least 90 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, November is the cheapest month in which you can book a flight from Boston to San Francisco (average of $149). Flying from Boston to San Francisco in January is currently the most expensive (average of $197). 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 March 30, 2026.

It’s typically best to fly out from Boston to San Francisco in the evening. Doing so could potentially save you 31% 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 28, 2026.

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 afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Boston to San Francisco?

The best insider tips for Boston to San Francisco flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to San Francisco trip
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on United Airlines and SFO

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

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

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

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 March 30, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andHawaiian 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
7.9
Good
12,139 reviews

Food

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Alaska Airlines
7.9
Good
12,139 reviews
Alaska Airlines
7.9
Good
12,139 reviews

Food

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Delta
7.9
Good
8,358 reviews
Alaska Airlines
7.9
Good
12,139 reviews

Food

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Hawaiian Airlines
7.8
Good
2,837 reviews
Alaska Airlines
7.9
Good
12,139 reviews

Food

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
United Airlines
7.4
Good
9,514 reviews
Alaska Airlines
7.9
Good
12,139 reviews

Food

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
JetBlue
7.2
Good
2,907 reviews
Alaska Airlines
7.9
Good
12,139 reviews

Food

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the 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 27m for a nonstop flight. There are 20 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 88 times in the past calendar month.

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

    For as low as $297, Southwest can have you in San Francisco from Boston in 6h 40m. The distance between Boston and San Francisco is about 2696 mi. This flight may include one or multiple stops.

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

    According to our current data, Frontier ($119), Hawaiian Airlines ($129), and Southwest ($153) offers the cheapest pricing from Boston to San Francisco. Frontier is currently priced 68% 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 $85 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $118 and JetBlue from $118 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: Southwest (100%), Japan Airlines (85%), Delta (83%).

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

    On average you can expect to pay $1,063 for a flight from Boston to San Francisco. The cheapest flight overall is $138 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at $223.

  • 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, November is the cheapest month in which you can book a flight from Boston to San Francisco (average of $149). Flying from Boston to San Francisco in January is currently the most expensive (average of $197). 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
South San Francisco
Santa Cruz
Santa Clara
Livermore
Roseville
Rancho Cordova
San Bruno
Watsonville
San Ramon
Sunnyvale
Vacaville
San Carlos
Redwood City
Turlock
San Lorenzo
Davis
Manteca
Union City
Elk Grove
Foster City

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 March 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$119Average$238FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$129Average$303FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$153Average$389FlexibilityNo cancel feeOn-time63%
DeltaCheapest$157Average$380FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$172Average$363FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$207Average$334FlexibilityNo cancel feeOn-time83%
Alaska AirlinesCheapest$208Average$351FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$231Average$421FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$267Average$417FlexibilityNo cancel feeOn-time71%

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