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Cheap flights from Boston to San Francisco from $208

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
17 May — 24 May1
1 adult
1 adult, Economy, 0 bags
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 Tuesday or Monday and return on a Monday

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 17 April 2026.

Tue 2/608:05
BOS
-
SFO
1 stop9h 56m
Alaska Airlines
Tue 9/616:44
SFO
-
BOS
1 stop10h 00m
Alaska Airlines
Deal found 13/4$386
Tue 5/506:20
BOS
-
SFO
Nonstop6h 45m
JetBlue
Wed 6/507:00
SFO
-
BOS
Nonstop5h 35m
JetBlue
Deal found 12/4$414
Tue 26/518:40
BOS
-
SFO
1 stop17h 53m
Alaska Airlines
Fri 29/506:16
SFO
-
BOS
1 stop20h 28m
Alaska Airlines
Deal found 16/4$421
Wed 15/708:28
BOS
-
SFO
1 stop9h 46m
Alaska Airlines
Tue 21/707:55
SFO
-
BOS
1 stop18h 45m
Alaska Airlines
Deal found 16/4$428
Wed 26/806:30
BOS
-
SFO
1 stop16h 49m
Delta
Wed 2/914:50
SFO
-
BOS
Nonstop5h 51m
Delta
Deal found 13/4$432
Tue 2/607:28
BOS
-
SFO
Nonstop6h 27m
United Airlines
Wed 10/607:00
SFO
-
BOS
Nonstop5h 54m
United Airlines
Deal found 15/4$434
Fri 1/506:00
BOS
-
SFO
1 stop14h 34m
Multiple Airlines
Sun 3/520:45
SFO
-
BOS
Nonstop5h 42m
Multiple Airlines
Deal found 15/4$439
Thu 23/706:00
BOS
-
SFO
Nonstop6h 27m
United Airlines
Tue 4/818:56
SFO
-
BOS
1 stop8h 02m
United Airlines
Deal found 12/4$442
Tue 5/507:00
BOS
-
SFO
1 stop10h 21m
Alaska Airlines
Wed 6/509:00
SFO
-
BOS
1 stop11h 59m
Alaska Airlines
Deal found 12/4$443
Thu 7/507:00
BOS
-
SFO
1 stop10h 21m
Alaska Airlines
Sat 16/517:41
SFO
-
BOS
1 stop9h 03m
Alaska Airlines
Deal found 13/4$446
Thu 30/720:20
BOS
-
SFO
Nonstop6h 37m
United Airlines
Sat 8/823:05
SFO
-
BOS
Nonstop5h 56m
United Airlines
Deal found 16/4$448

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 17 April 2026.

Round-trip from

$386

One-way from

$208

Popular in

April

Cheapest in

September

Average price

$647
Alaska Airlines
  • Alaska Airlines
  • 3/6-9/6
  • 2 total stops
  • 21h 56m total
  • Boston to San Francisco
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Delta
  • Delta
  • 13/5
  • Nonstop
  • 6h 33m total
  • Boston to San Francisco
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($48 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($15 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
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 17 April 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

Tue 12/5

06:00-09:45

Nonstop6h 45m

San Francisco

Sat 16/5

23:56-11:01

1 stop8h 05m

$428

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 17/8

20:55-00:56

Nonstop7h 01m

San Francisco

Wed 26/8

14:50-23:41

Nonstop5h 51m

$428

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 12/5

19:27-01:16

1 stop8h 49m

San Francisco

Wed 13/5

23:20-08:23

Nonstop6h 03m

$428

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 2/5

07:40-11:29

Nonstop6h 49m

San Francisco

Sat 9/5

13:00-21:50

Nonstop5h 50m

$449

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 29/5

08:05-15:01

1 stop9h 56m

San Francisco

Fri 5/6

06:16-05:44

1 stop20h 28m

$456

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 29/5

19:07-22:49

Nonstop6h 42m

San Francisco

Fri 5/6

15:10-23:58

Nonstop5h 48m

$540

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 26/6

16:45-00:10

1 stop10h 25m

San Francisco

Sat 4/7

09:10-23:00

1 stop10h 50m

$547

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 12/6

17:30-23:25

1 stop8h 55m

San Francisco

Sun 14/6

06:00-23:00

1 stop14h 00m

$551

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 16/6

08:28-23:08

1 stop17h 40m

San Francisco

Wed 24/6

07:55-05:40

1 stop18h 45m

$560

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 1/6

18:55-00:20

1 stop8h 25m

San Francisco

Fri 12/6

19:45-08:40

2 stops9h 55m

$560

Flights are sorted by cheapest return flights first.

Deals found on 12/4

Showing 1-10 of 23 resultsSorted by cheapest first
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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?

Use this chart to determine the optimal time to book a return flight from Boston to San Francisco. Price data was last updated on 10 April 2026.

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 90 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, September is the cheapest month in which you can book a flight from Boston to San Francisco (average of $471). Flying from Boston to San Francisco in April is currently the most expensive (average of $647). 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 17 April 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 17 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 45m. 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 WestJet (88%), Japan Airlines (79%) and United Airlines (78%).

  • 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, September is the cheapest month in which you can book a flight from Boston to San Francisco (average of $471). Flying from Boston to San Francisco in April is currently the most expensive (average of $647). 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

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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

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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.

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