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Cheap flights from Boston to San Francisco from $183

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 15/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
18 Dec — 25 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in February or March, booked 58 days in advance, depart on a Thursday or Monday and return on a Monday

Cheap 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 18 November 2025.

Round-trip from

$341

One-way from

$189

Popular in

December

Cheapest in

February

Average price

$583
JetBlue
  • JetBlue
  • 9/12-16/12
  • Nonstop
  • 12h 17m total
  • Boston to San Francisco
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Alaska Airlines
  • Alaska Airlines
  • 21/1
  • 1 total stop
  • 9h 27m total
  • Boston to San Francisco
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Highest demand for flights based on searches. 4% potential increase in price ($36 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease ($15 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Find 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 18 November 2025.

Tue 9/1220:14BOS - SFO
Nonstop6h 45mJetBlue
Wed 10/1211:45SFO - BOS
Nonstop5h 34mJetBlue
Deal found 16/11$341
Fri 5/1206:45BOS - SFO
Nonstop6h 48mJetBlue
Thu 11/1215:20SFO - BOS
Nonstop5h 31mJetBlue
Deal found 16/11$348
Sat 13/1220:05BOS - SFO
Nonstop6h 54mDelta
Tue 16/1212:40SFO - BOS
Nonstop5h 40mDelta
Deal found 17/11$350
Mon 8/1220:05BOS - SFO
Nonstop6h 54mDelta
Tue 16/1212:40SFO - BOS
Nonstop5h 40mDelta
Deal found 17/11$352
Mon 8/1215:45BOS - SFO
Nonstop6h 49mJetBlue
Mon 15/1221:00SFO - BOS
1 stop7h 42mJetBlue
Deal found 16/11$353
Sat 13/1207:25BOS - SFO
Nonstop6h 57mDelta
Wed 28/107:10SFO - BOS
Nonstop5h 41mDelta
Deal found 17/11$356
Thu 25/1216:40BOS - SFO
Nonstop6h 53mJetBlue
Tue 30/1215:22SFO - BOS
Nonstop5h 33mJetBlue
Deal found 17/11$359
Tue 16/1206:45BOS - SFO
Nonstop6h 48mJetBlue
Mon 29/1215:22SFO - BOS
Nonstop5h 33mJetBlue
Deal found 16/11$361
Mon 8/1206:00BOS - SFO
Nonstop6h 45mUnited Airlines
Mon 15/1222:55SFO - BOS
Nonstop5h 41mUnited Airlines
Deal found 17/11$364
Thu 11/1206:00BOS - SFO
1 stop8h 49mUnited Airlines
Tue 20/111:05SFO - BOS
Nonstop5h 46mUnited Airlines
Deal found 17/11$372
Sun 7/1207:25BOS - SFO
Nonstop6h 57mDelta
Tue 16/1221:41SFO - BOS
Nonstop5h 43mDelta
Deal found 17/11$373
Thu 4/1220:14BOS - SFO
Nonstop6h 45mJetBlue
Mon 15/1221:00SFO - BOS
1 stop7h 42mJetBlue
Deal found 16/11$376

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 18 November 2025.
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

Fri 5/12

20:14-23:59

Nonstop6h 45m

San Francisco

Fri 12/12

21:16-05:50

Nonstop5h 34m

$348

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 7/12

07:25-11:22

Nonstop6h 57m

San Francisco

Wed 10/12

12:40-21:20

Nonstop5h 40m

$364

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 2/2

20:05-23:59

Nonstop6h 54m

San Francisco

Wed 11/2

08:26-17:05

Nonstop5h 39m

$372

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 20/1

16:20-22:47

1 stop9h 27m

San Francisco

Tue 27/1

07:00-17:39

1 stop7h 39m

$378

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 7/12

06:00-09:45

Nonstop6h 45m

San Francisco

Fri 12/12

23:44-10:50

1 stop8h 06m

$379

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 28/1

06:00-11:57

1 stop8h 57m

San Francisco

Wed 11/3

23:20-09:56

1 stop7h 36m

$387

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 21/1

07:30-17:47

1 stop13h 17m

San Francisco

Tue 10/2

13:00-21:37

Nonstop5h 37m

$391

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 8/1

10:56-14:51

Nonstop6h 55m

San Francisco

Mon 12/1

13:00-21:42

Nonstop5h 42m

$395

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 25/3

07:00-10:59

Nonstop6h 59m

San Francisco

Sun 29/3

08:25-21:24

1 stop9h 59m

$407

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 7/12

07:25-11:22

Nonstop6h 57m

San Francisco

Sun 7/12

21:41-06:24

Nonstop5h 43m

$410

Flights are sorted by cheapest return flights first.

Deals found on 16/11

Showing 1-10 of 22 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 14 November 2025.

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 58 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 $150). Flying from Boston to San Francisco in December is currently the most expensive (average of $278). 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 18 November 2025.

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 82% on your trip compared to booking a flight in the afternoon.

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 28 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 China Eastern (100%), Air China (97%) and ANA (93%).

  • 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 $150). Flying from Boston to San Francisco in December is currently the most expensive (average of $278). 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
Los Gatos
Mountain View
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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