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Cheap flights from Boston to San Francisco from $228

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 15/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
30 Jun — 7 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in January or September, booked 46 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 31 May 2026.

Thu 3/913:30
BOS
-
SFO
1 stop9h 00m
Southwest
Tue 8/919:25
SFO
-
BOS
2 stops11h 05m
Southwest
Deal found 28/5$429
Thu 13/814:15
BOS
-
SFO
2 stops10h 40m
Southwest
Tue 18/807:40
SFO
-
BOS
2 stops13h 25m
Southwest
Deal found 28/5$433
Tue 28/716:25
BOS
-
SFO
1 stop9h 10m
Southwest
Tue 11/811:15
SFO
-
BOS
1 stop10h 10m
Southwest
Deal found 28/5$434
Tue 11/814:45
BOS
-
SFO
2 stops10h 20m
Southwest
Mon 17/819:55
SFO
-
BOS
2 stops10h 35m
Southwest
Deal found 29/5$438
Tue 21/706:00
BOS
-
SFO
Nonstop6h 27m
United Airlines
Tue 28/723:59
SFO
-
BOS
1 stop8h 17m
United Airlines
Deal found 28/5$441
Tue 28/705:50
BOS
-
SFO
1 stop7h 40m
Southwest
Wed 12/823:05
SFO
-
BOS
2 stops10h 25m
Southwest
Deal found 29/5$442
Fri 3/717:05
BOS
-
SFO
Nonstop6h 51m
Delta
Tue 7/707:10
SFO
-
BOS
Nonstop5h 45m
Delta
Deal found 29/5$448
Sat 11/706:35
BOS
-
SFO
Nonstop6h 30m
JetBlue
Sat 18/721:00
SFO
-
BOS
Nonstop5h 44m
JetBlue
Deal found 28/5$449
Tue 28/706:00
BOS
-
SFO
Nonstop6h 27m
United Airlines
Tue 11/822:58
SFO
-
BOS
Nonstop5h 56m
United Airlines
Deal found 28/5$451
Wed 12/805:35
BOS
-
SFO
1 stop8h 00m
Southwest
Sun 16/807:55
SFO
-
BOS
1 stop9h 30m
Southwest
Deal found 29/5$455
Thu 13/814:15
BOS
-
SFO
2 stops10h 40m
Southwest
Mon 17/823:40
SFO
-
BOS
1 stop9h 35m
Southwest
Deal found 29/5$456
Sat 5/911:05
BOS
-
SFO
Nonstop6h 29m
Delta
Mon 14/906:50
SFO
-
BOS
1 stop14h 01m
Delta
Deal found 29/5$458

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 31 May 2026.

Round-trip from

$429

One-way from

$228

Popular in

April

Cheapest in

January

Average price

$601

Good one-way deal

$533 or less
Southwest
  • Southwest
  • 3/9-8/9
  • 3 total stops
  • 20h 05m total
  • Boston to San Francisco
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United Airlines
  • United Airlines
  • 19/8
  • 1 total stop
  • 8h 18m total
  • Boston to San Francisco
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($64 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average return price).
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Average for round-trip flights in May 2026
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Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
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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 31 May 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

Wed 22/7

17:30-00:05

1 stop9h 35m

San Francisco

Thu 23/7

18:50-08:10

2 stops10h 20m

$483

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 25/6

07:28-10:55

Nonstop6h 27m

San Francisco

Mon 29/6

23:05-08:01

Nonstop5h 56m

$484
Fastest return journey

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 5/9

20:55-00:31

Nonstop6h 36m

San Francisco

Tue 15/9

15:15-23:58

Nonstop5h 43m

$487

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 9/7

06:00-09:27

Nonstop6h 27m

San Francisco

Sun 12/7

16:15-01:11

Nonstop5h 56m

$490

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 1/10

19:59-09:37

1 stop16h 38m

San Francisco

Sat 31/10

16:18-07:29

1 stop12h 11m

$519

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 18/9

07:12-14:49

1 stop10h 37m

San Francisco

Mon 21/9

15:26-07:39

1 stop13h 13m

$519

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 15/7

14:25-22:35

2 stops11h 10m

San Francisco

Tue 21/7

23:40-12:15

1 stop9h 35m

$522

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 13/6

07:20-10:59

Nonstop6h 39m

San Francisco

Sat 20/6

12:20-21:02

Nonstop5h 42m

$525

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 19/8

14:45-22:20

2 stops10h 35m

San Francisco

Tue 25/8

19:25-09:30

2 stops11h 05m

$531

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 13/9

06:00-09:30

Nonstop6h 30m

San Francisco

Thu 17/9

07:00-15:55

Nonstop5h 55m

$547

Flights are sorted by cheapest return flights first.

Deals found on 26/5

Showing 1-10 of 24 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?

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 $473). Flying from Boston to San Francisco in April is currently the most expensive (average of $636). 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 31 May 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 14 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 27m. 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 (91%), Korean Air (89%) and United Airlines (86%).

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

    While on average a flight from Boston to San Francisco is generally $1,902, our data shows the cheapest flight currently is $213. When looking at the most popular route, (Boston Logan Intl - San Francisco), you can expect to pay $427 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 $473). Flying from Boston to San Francisco in April is currently the most expensive (average of $636). 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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