Find flights
Deals
When to book
FAQs

Cheap flights from Boston to San Francisco from $241

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 29/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
13 Aug — 20 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Boston to San Francisco

Enter your travel dates to find the best prices.

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 14 July 2026.

Sat 22/805:50
BOS
-
SFO
2 stops13h 00m
Southwest
Sat 29/823:40
SFO
-
BOS
2 stops10h 00m
Southwest
Deal found 10/7$397
Sat 29/813:00
BOS
-
SFO
2 stops10h 35m
Southwest
Mon 7/912:30
SFO
-
BOS
1 stop8h 55m
Southwest
Deal found 9/7$398
Mon 17/820:55
BOS
-
SFO
Nonstop6h 35m
JetBlue
Wed 26/815:18
SFO
-
BOS
Nonstop5h 41m
JetBlue
Deal found 9/7$400
Sat 5/916:43
BOS
-
SFO
1 stop10h 55m
JetBlue
Wed 9/911:45
SFO
-
BOS
Nonstop5h 49m
JetBlue
Deal found 13/7$401
Sun 23/812:45
BOS
-
SFO
1 stop9h 18m
Frontier
Sun 30/822:35
SFO
-
BOS
1 stop10h 12m
Frontier
Deal found 9/7$402
Thu 20/814:15
BOS
-
SFO
2 stops10h 40m
Southwest
Tue 25/819:10
SFO
-
BOS
2 stops11h 20m
Southwest
Deal found 9/7$405
Wed 30/907:35
BOS
-
SFO
Nonstop6h 29m
Delta
Mon 12/1015:00
SFO
-
BOS
Nonstop5h 39m
Delta
Deal found 10/7$407
Wed 16/916:00
BOS
-
SFO
1 stop10h 31m
JetBlue
Sun 20/921:45
SFO
-
BOS
Nonstop5h 47m
JetBlue
Deal found 9/7$408
Wed 2/910:50
BOS
-
SFO
2 stops11h 15m
Southwest
Wed 9/907:40
SFO
-
BOS
2 stops13h 25m
Southwest
Deal found 9/7$410
Wed 12/805:45
BOS
-
SFO
1 stop8h 27m
United Airlines
Mon 17/814:07
SFO
-
BOS
Nonstop5h 52m
United Airlines
Deal found 9/7$413
Sat 5/913:00
BOS
-
SFO
2 stops11h 25m
Southwest
Wed 9/907:40
SFO
-
BOS
2 stops13h 25m
Southwest
Deal found 9/7$414
Tue 25/814:45
BOS
-
SFO
1 stop12h 53m
JetBlue
Wed 26/815:18
SFO
-
BOS
Nonstop5h 41m
JetBlue
Deal found 12/7$415

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 14 July 2026.

Round-trip from

$397

One-way from

$241

Popular in

June

Cheapest in

January

Average price

$580

Good one-way deal

$560 or less
Southwest
  • Southwest
  • 22/8-29/8
  • 4 total stops
  • 23h 00m total
  • Boston to San Francisco
Search Deals
United Airlines
  • United Airlines
  • 29/7
  • Nonstop
  • 6h 27m total
  • Boston to San Francisco
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($50 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
Search Deals

Cheapflights Fare Finder

 
Customise 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 647,157 searches. Data last updated 14 July 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 return flight

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 5/9

07:45-11:15

Nonstop6h 30m

San Francisco

Wed 9/9

22:55-09:33

1 stop7h 38m

$405

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 7/10

07:45-11:25

Nonstop6h 40m

San Francisco

Mon 12/10

15:00-23:39

Nonstop5h 39m

$407
Fastest return journey

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 25/8

08:00-11:34

Nonstop6h 34m

San Francisco

Wed 26/8

15:18-23:59

Nonstop5h 41m

$457

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 25/8

10:50-19:05

2 stops11h 15m

San Francisco

Tue 1/9

07:40-21:25

2 stops10h 45m

$467

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 23/11

20:55-00:50

Nonstop6h 55m

San Francisco

Tue 1/12

21:55-06:41

Nonstop5h 46m

$472

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 19/9

12:10-21:25

2 stops12h 15m

San Francisco

Wed 23/9

07:40-00:05

2 stops13h 25m

$483

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 22/8

07:05-13:00

1 stop8h 55m

San Francisco

Sat 29/8

11:35-00:25

1 stop9h 50m

$486

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 26/8

05:35-10:35

1 stop8h 00m

San Francisco

Wed 2/9

11:15-00:25

1 stop10h 10m

$486

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 19/8

14:45-22:05

2 stops10h 20m

San Francisco

Wed 26/8

23:05-14:55

2 stops12h 50m

$501

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 11/11

05:35-14:55

2 stops12h 20m

San Francisco

Sat 14/11

16:30-08:05

2 stops12h 35m

$508

Flights are sorted by cheapest return flights first.

Deals found on 13/7

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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 return 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?

The price you pay for your flight from Boston to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 45 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 $489). Flying from Boston to San Francisco in June is currently the most expensive (average of $665). 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 14 July 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Boston to San Francisco as you normally would.

How much does it cost for a return flight from Boston to San Francisco?

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.

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

    Flights from Boston Logan Intl to San Francisco have been viewed 2 times in the past calendar month.

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

    Departing from Boston to San Francisco will take you 6h 40m. The distance between Boston and San Francisco is about 4339 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    The top 3 most reliable airlines when flying from Boston to San Francisco are Air China (86%), ANA (82%) and Korean Air (80%).

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

    While on average a flight from Boston to San Francisco is generally $1,076, our data shows the cheapest flight currently is $330. When looking at the most popular route, (Boston Logan Intl - San Francisco), you can expect to pay $489 for that flight.

  • 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 holiday 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 $489). Flying from Boston to San Francisco in June is currently the most expensive (average of $665). 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

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Sausalito
Davis
Milpitas
Vallejo

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.

Alternative routes for Boston to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.
Boston to Los Angeles flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Boston to San Francisco?

Cheapflights helps you search for flights from Boston to San Francisco via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Boston to San Francisco?

Millions of users choose and trust Cheapflights to book the best flight deals from Boston to San Francisco for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Boston to San Francisco with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Boston to San Francisco flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Boston to San Francisco become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to San Francisco from Boston today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.