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Cheap flights from San Francisco to Boston from £104

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

Cheapflights Tip: The best prices from San Francisco to Boston Logan Intl are usually found in January or February, booked 69 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

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 5 November 2025.

Round-trip from

£174

One-way from

£102

Popular in

June

Cheapest in

January

Average price

£278

Good one-way deal

£75 or less
Delta
  • Delta
  • 13/1-20/1
  • Nonstop
  • 12h 41m total
  • San Francisco to Boston
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Alaska Airlines
  • Alaska Airlines
  • 4/12
  • 1 total stop
  • 7h 52m total
  • San Francisco to Boston
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Highest demand for flights based on searches. 9% potential increase in price (£24 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease (£4 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Price to beat on a one-way flight from San Francisco to Boston Logan Intl.
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Find flight deals from San Francisco to Boston

Enter your travel dates to find the best prices.

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 5 November 2025.

Mon 17/1107:00SFO - BOS
Nonstop5h 41mAlaska Airlines
Mon 17/1118:59BOS - SFO
Nonstop6h 51mAlaska Airlines
Deal found 2/11£177
Wed 3/1221:57SFO - BOS
1 stop16h 55mAlaska Airlines
Wed 10/1216:24BOS - SFO
1 stop9h 24mAlaska Airlines
Deal found 3/11£181
Thu 4/1208:25SFO - BOS
Nonstop5h 41mUnited Airlines
Thu 11/1206:00BOS - SFO
Nonstop6h 45mUnited Airlines
Deal found 5/11£181
Thu 25/1207:30SFO - BOS
Nonstop5h 40mDelta
Wed 7/117:40BOS - SFO
Nonstop7h 04mDelta
Deal found 3/11£183
Thu 4/1207:00SFO - BOS
1 stop7h 52mAlaska Airlines
Sat 13/1218:52BOS - SFO
Nonstop6h 56mAlaska Airlines
Deal found 5/11£185
Thu 25/1208:14SFO - BOS
Nonstop5h 39mJetBlue
Sat 10/120:05BOS - SFO
Nonstop6h 54mJetBlue
Deal found 3/11£187
Wed 3/1221:41SFO - BOS
Nonstop5h 43mDelta
Wed 13/519:55BOS - SFO
Nonstop7h 01mDelta
Deal found 4/11£187
Mon 8/1218:59SFO - BOS
1 stop17h 25mAlaska Airlines
Wed 10/1216:24BOS - SFO
1 stop9h 24mAlaska Airlines
Deal found 3/11£188
Fri 5/1219:25SFO - BOS
1 stop9h 04mAlaska Airlines
Mon 8/1218:52BOS - SFO
Nonstop6h 56mAlaska Airlines
Deal found 5/11£189
Mon 24/1121:20SFO - BOS
Nonstop5h 34mJetBlue
Tue 2/1210:50BOS - SFO
Nonstop6h 46mJetBlue
Deal found 4/11£190
Mon 17/1119:37SFO - BOS
1 stop8h 52mAlaska Airlines
Tue 18/1109:00BOS - SFO
1 stop9h 43mAlaska Airlines
Deal found 3/11£192
Thu 4/1207:00SFO - BOS
1 stop7h 52mAlaska Airlines
Fri 12/1218:52BOS - SFO
Nonstop6h 56mAlaska Airlines
Deal found 5/11£193

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 858,174 searches. Data last updated 5 November 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

Wed 3/12

21:41-06:24

Nonstop5h 43m

Boston Logan Intl

Thu 19/2

07:45-11:49

Nonstop7h 04m

£181

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Wed 3/12

07:00-15:37

Nonstop5h 37m

Boston Logan Intl

Mon 15/12

18:52-22:48

Nonstop6h 56m

£181

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Mon 17/11

21:48-06:25

Nonstop5h 37m

Boston Logan Intl

Tue 18/11

16:45-20:38

Nonstop6h 53m

£181

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Tue 13/1

13:00-21:37

Nonstop5h 37m

Boston Logan Intl

Thu 22/1

07:45-11:49

Nonstop7h 04m

£185

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Wed 19/11

15:20-23:51

Nonstop5h 31m

Boston Logan Intl

Mon 24/11

07:05-10:56

Nonstop6h 51m

£194

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Tue 2/12

21:16-05:50

Nonstop5h 34m

Boston Logan Intl

Sun 4/1

05:30-14:11

1 stop11h 41m

£195

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Wed 19/11

07:00-15:34

Nonstop5h 34m

Boston Logan Intl

Mon 24/11

07:25-11:20

Nonstop6h 55m

£197

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Sun 3/5

22:55-07:33

Nonstop5h 38m

Boston Logan Intl

Tue 5/5

15:50-19:34

Nonstop6h 44m

£209

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Tue 28/4

07:00-15:51

Nonstop5h 51m

Boston Logan Intl

Sat 2/5

07:05-11:02

Nonstop6h 57m

£209

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

Sat 2/5

07:00-15:51

Nonstop5h 51m

Boston Logan Intl

Tue 5/5

19:55-23:56

Nonstop7h 01m

£209

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 23 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 31 October 2025.

Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, February is the cheapest month in which you can book a flight from San Francisco to Boston (average of £91). Flying from San Francisco to Boston in June is currently the most expensive (average of £167). 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 5 November 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 86% on flights from San Francisco to Boston by exploring options for tickets 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?

    This flight path from San Francisco to Boston Logan Intl was viewed by 8 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?

    Delta, Alaska Airlines, and JetBlue can get you from San Francisco to Boston in just under 5h 31m. Your travel time will be generally consistent. There are 2696 mi between San Francisco and Boston. Generally, flights for this route are direct.

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

    Before booking your flight to Boston from San Francisco, check out the most reliable airlines to get you to your destination on time: Etihad Airways (100%), Air China (94%), Japan Airlines( 83%).

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

    The cheapest flight price from San Francisco to Boston is £67. On average you can expect to pay £145. The most popular route, (San Francisco - Boston Logan Intl), can usually be booked for £314.

  • 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, February is the cheapest month in which you can book a flight from San Francisco to Boston (average of £91). Flying from San Francisco to Boston in June is currently the most expensive (average of £167). 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
Burlington
Cambridge
Peabody
Somerville
Quincy
Waltham
Chelmsford

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

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

Cheapflights simply makes it quick and affordable to book flights from San Francisco to Boston by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from San Francisco to Boston with no change fees?

Need flexible booking options for your flight to Boston from San Francisco? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Of course! You can now track prices for flights from San Francisco to Boston and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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