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Cheap flights from Boston to San Francisco from $160

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
15 Mar — 22 Mar1
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 13 February 2026.

Tue 3/307:00
BOS
-
SFO
1 stop10h 02m
Alaska Airlines
Tue 10/308:42
SFO
-
BOS
1 stop12h 17m
Alaska Airlines
Deal found 10/2$319
Wed 4/307:00
BOS
-
SFO
1 stop11h 48m
Alaska Airlines
Tue 17/311:34
SFO
-
BOS
1 stop9h 25m
Alaska Airlines
Deal found 12/2$326
Wed 11/317:20
BOS
-
SFO
Nonstop6h 53m
Delta
Tue 24/313:00
SFO
-
BOS
Nonstop5h 39m
Delta
Deal found 11/2$333
Wed 4/317:44
BOS
-
SFO
1 stop9h 15m
Alaska Airlines
Mon 9/319:28
SFO
-
BOS
1 stop8h 26m
Alaska Airlines
Deal found 12/2$340
Tue 10/307:00
BOS
-
SFO
1 stop10h 02m
Alaska Airlines
Tue 10/316:21
SFO
-
BOS
1 stop11h 33m
Alaska Airlines
Deal found 12/2$346
Sat 2/521:10
BOS
-
SFO
Nonstop6h 44m
JetBlue
Sat 23/521:30
SFO
-
BOS
Nonstop5h 38m
JetBlue
Deal found 10/2$347
Thu 5/317:44
BOS
-
SFO
1 stop9h 15m
Alaska Airlines
Tue 10/311:34
SFO
-
BOS
1 stop9h 25m
Alaska Airlines
Deal found 12/2$351
Tue 3/307:45
BOS
-
SFO
Nonstop7h 02m
Delta
Wed 25/313:00
SFO
-
BOS
Nonstop5h 39m
Delta
Deal found 11/2$354
Sat 18/420:16
BOS
-
SFO
Nonstop6h 43m
United Airlines
Tue 21/412:35
SFO
-
BOS
1 stop8h 24m
United Airlines
Deal found 11/2$356
Thu 26/217:35
BOS
-
SFO
Nonstop7h 00m
Delta
Wed 4/307:10
SFO
-
BOS
Nonstop5h 39m
Delta
Deal found 10/2$361

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 13 February 2026.

Round-trip from

$319

One-way from

$160

Popular in

December

Cheapest in

September

Average price

$544

Good one-way deal

$321 or less
Alaska Airlines
  • Alaska Airlines
  • 3/3-10/3
  • 2 total stops
  • 24h 11m total
  • Boston to San Francisco
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 10/3
  • 1 total stop
  • 12h 05m total
  • Boston to San Francisco
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($17 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
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 13 February 2026.
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

Wed 25/3

17:20-21:13

Nonstop6h 53m

San Francisco

Tue 31/3

07:25-16:00

Nonstop5h 35m

$333

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 13/5

16:59-20:36

Nonstop6h 37m

San Francisco

Tue 19/5

21:54-06:45

Nonstop5h 51m

$347

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 1/3

07:45-11:47

Nonstop7h 02m

San Francisco

Tue 10/3

07:25-15:57

Nonstop5h 32m

$363

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 5/3

17:44-23:59

1 stop9h 15m

San Francisco

Mon 9/3

19:28-06:54

1 stop8h 26m

$365

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 27/3

07:40-11:38

Nonstop6h 58m

San Francisco

Wed 8/4

07:25-16:00

Nonstop5h 35m

$368

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 20/3

05:45-09:43

Nonstop6h 58m

San Francisco

Tue 24/3

23:59-10:49

1 stop7h 50m

$375

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 14/3

19:34-01:28

1 stop8h 54m

San Francisco

Mon 16/3

21:30-06:08

Nonstop5h 38m

$403

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 5/3

05:45-09:43

Nonstop6h 58m

San Francisco

Mon 9/3

23:59-10:50

1 stop7h 51m

$403

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 29/5

18:40-01:44

1 stop10h 04m

San Francisco

Wed 3/6

21:30-06:08

Nonstop5h 38m

$417

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 3/4

21:15-00:59

Nonstop6h 44m

San Francisco

Tue 14/4

22:50-10:38

1 stop8h 48m

$426

Flights are sorted by cheapest return flights first.

Deals found on 9/2

Showing 1-10 of 23 results
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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 6 February 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, March is the cheapest month in which you can book a flight from Boston to San Francisco (average of $138). Flying from Boston to San Francisco in January is currently the most expensive (average of $277). 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 13 February 2026.

A simple way to save on the total cost of your ticket is to fly from Boston to San Francisco in the evening. If you’re flexible enough to do this you can expect to save up to 88% on your trip compared to booking a flight in the morning.

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 21 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 37m. 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 KLM (93%), JetBlue (80%) and Hawaiian Airlines (77%).

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

    While on average a flight from Boston to San Francisco is generally $321, our data shows the cheapest flight currently is $145. When looking at the most popular route, (Boston Logan Intl - San Francisco), you can expect to pay $305 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, March is the cheapest month in which you can book a flight from Boston to San Francisco (average of $138). Flying from Boston to San Francisco in January is currently the most expensive (average of $277). 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
Sausalito
Santa Cruz
Davis
Milpitas

Browse thousands of different options on Cheapflights for your next trip

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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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