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Cheap flights from San Francisco to Boston from $209

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 21/10. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — BOS
16 Oct — 23 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from San Francisco to Boston Logan Intl are usually found in January or February, booked 64 days in advance, depart on a Monday or Tuesday and return on a Thursday

Cheap flight deals from San Francisco to Boston

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Boston (BOS). 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 16 September 2025.

Round-trip from

$353

One-way from

$209

Popular in

December

Cheapest in

January

Average price

$522
Frontier
  • Frontier
  • 31/10-7/11
  • 4 total stops
  • 26h 33m total
  • San Francisco to Boston
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Southwest
  • Southwest
  • 21/10
  • 1 total stop
  • 8h 20m total
  • San Francisco to Boston
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($1 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease ($16 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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Find flight deals from San Francisco to Boston

Cheapest flights from San Francisco to Boston
Explore the most affordable flight options available from San Francisco to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2025.

Fri 31/1020:09SFO - BOS
2 stops11h 39mFrontier
Fri 7/1112:20BOS - SFO
2 stops14h 54mFrontier
Deal found 15/9$353
Fri 14/1107:00SFO - BOS
Nonstop5h 41mAlaska Airlines
Fri 14/1118:59BOS - SFO
Nonstop6h 51mAlaska Airlines
Deal found 15/9$410
Sat 25/1008:41SFO - BOS
Nonstop5h 58mJetBlue
Sat 25/1020:15BOS - SFO
Nonstop7h 00mJetBlue
Deal found 15/9$411
Tue 4/1112:15SFO - BOS
1 stop7h 30mSouthwest
Tue 11/1107:45BOS - SFO
1 stop8h 35mSouthwest
Deal found 15/9$416
Mon 20/1007:11SFO - BOS
Nonstop5h 49mHawaiian Airlines
Fri 24/1020:25BOS - SFO
Nonstop6h 40mHawaiian Airlines
Deal found 16/9$419
Mon 20/1015:50SFO - BOS
Nonstop5h 40mJetBlue
Thu 23/1014:55BOS - SFO
Nonstop6h 28mJetBlue
Deal found 14/9$420
Fri 12/1207:00SFO - BOS
Nonstop5h 37mAlaska Airlines
Tue 16/1216:24BOS - SFO
1 stop32h 22mAlaska Airlines
Deal found 14/9$422
Sat 25/1010:55SFO - BOS
1 stop9h 25mSouthwest
Wed 29/1006:45BOS - SFO
1 stop11h 15mSouthwest
Deal found 15/9$432
Wed 22/1011:22SFO - BOS
1 stop9h 37mAlaska Airlines
Wed 29/1018:59BOS - SFO
Nonstop6h 51mAlaska Airlines
Deal found 15/9$434
Thu 20/1114:00SFO - BOS
Nonstop5h 29mJetBlue
Mon 24/1121:25BOS - SFO
Nonstop6h 44mJetBlue
Deal found 15/9$440
Mon 20/1007:00SFO - BOS
Nonstop5h 42mDelta
Wed 29/1006:15BOS - SFO
1 stop18h 57mDelta
Deal found 15/9$444
Fri 31/1008:00SFO - BOS
1 stop12h 11mJetBlue
Tue 4/1107:10BOS - SFO
Nonstop6h 50mJetBlue
Deal found 16/9$446

Cheapflights Fare Finder

 
Customise your flight search to find flights from San Francisco to Boston 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 16 September 2025.
Use the filters below to find and compare flights from San Francisco to Boston that are best for you.

Fly from

San Francisco

Fly to

Boston

Route

Depart

Return

Price

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Fri 31/10

12:10-20:43

Nonstop5h 33m

Boston Logan Intl

Tue 4/11

07:10-11:00

Nonstop6h 50m

$419

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Fri 31/10

12:35-23:05

1 stop7h 30m

Boston Logan Intl

Wed 5/11

07:20-13:55

1 stop9h 35m

$432

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Wed 29/10

05:10-16:10

1 stop8h 00m

Boston Logan Intl

Sat 1/11

08:00-11:54

Nonstop6h 54m

$434

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Thu 5/3

23:45-10:39

1 stop7h 54m

Boston Logan Intl

Tue 10/3

06:00-09:45

Nonstop6h 45m

$434

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Sat 18/10

15:10-23:57

Nonstop5h 47m

Boston Logan Intl

Sat 15/11

11:40-17:50

1 stop9h 10m

$434

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Sat 1/11

05:10-16:20

1 stop8h 10m

Boston Logan Intl

Mon 3/11

20:30-00:24

Nonstop6h 54m

$434

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Fri 31/10

08:05-16:52

Nonstop5h 47m

Boston Logan Intl

Fri 7/11

19:55-23:41

Nonstop6h 46m

$440

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Wed 29/10

08:15-16:47

Nonstop5h 32m

Boston Logan Intl

Tue 4/11

07:10-11:00

Nonstop6h 50m

$440

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Sun 12/10

07:00-15:42

Nonstop5h 42m

Boston Logan Intl

Tue 21/10

06:15-17:45

1 stop14h 30m

$446

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Thu 13/11

11:40-00:20

1 stop9h 40m

Boston Logan Intl

Sun 16/11

18:59-22:50

Nonstop6h 51m

$449

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 24 results
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Best time to book a flight from San Francisco to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from San Francisco 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 San Francisco to Boston

How far ahead should I book a flight from San Francisco to Boston?

Use this chart to determine the optimal time to book a return flight from San Francisco to Boston. Price data was last updated on 12 September 2025.

The best time to book flights from San Francisco to Boston is 64 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from San Francisco to Boston?

Currently, October is the cheapest month in which you can book a flight from San Francisco to Boston (average of $1,144). Flying from San Francisco to Boston in December is currently the most expensive (average of $1,631). 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 SFO to BOS?

Find hourly flight availability from San Francisco to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 16 September 2025.

It’s optimal to fly from San Francisco to Boston in the morning. By choosing this option you can save up to 31% on the cost of your flight, compared to a flight at midday.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Boston. 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 San Francisco to Boston flight route?

    The San Francisco to Boston Logan Intl flight path was viewed by 7 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Airlines like JetBlue, Southwest, and United Airlines fly from San Francisco to Boston in about 5h 33m. The time it takes to get you to your destination can typically vary by up to 2h 27m. Airlines will cover a distance of 4339 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from San Francisco to Boston one-way?

    The cheapet airlines for a one-way flight from San Francisco to Boston are Alaska Airlines ($210), JetBlue ($210), and Delta ($210).

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

    No one likes to see their flight delayed. When booking a flight from San Francisco to Boston consider choosing Etihad Airways(99%), China Eastern(92%) or Scandinavian Airlines(92%), as they are the most reliable in getting you off to your destination on time.

  • Can I find deals for flights from San Francisco to Boston that include hotel bookings?

    Yes. In addition to deals on San Francisco to Boston flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Boston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Boston.

  • Can I find deals for business class flights from San Francisco to Boston?

    Yes. Cheapflights offers flight deals from San Francisco to Boston 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 San Francisco to Boston?

    Currently, October is the cheapest month in which you can book a flight from San Francisco to Boston (average of $1,144). Flying from San Francisco to Boston in December is currently the most expensive (average of $1,631). 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 Boston?

Book flights to Boston if you plan to visit one of these locations
Revere
Cambridge

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for San Francisco to Boston

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

Fly with Cheapflights

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

When you search for this flight from San Francisco to Boston, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from San Francisco to Boston 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 San Francisco to Boston with no change fees?

Certainly. Search results for flights to Boston from San Francisco shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on San Francisco to Boston flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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