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Cheap flights from San Francisco to Boston from C$ 173

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 17/11. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — BOS
11 oct. — 18 oct.1
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 Tuesday or Monday 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 11 septiembre 2025.

Round-trip from

C$ 294

One-way from

C$ 173

Popular in

December

Cheapest in

January

Average price

C$ 467

Good one-way deal

C$ 621 or less
Southwest
  • Southwest
  • 24/10-28/10
  • 2 total stops
  • 20h 55m total
  • San Francisco to Boston
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Southwest
  • Southwest
  • 17/11
  • 2 total stops
  • 10h 05m total
  • San Francisco to Boston
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 1% potential price decrease (C$ 15 potential savings vs. average RT price).
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Average for round-trip flights in September 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

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 11 septiembre 2025.

vie. 24/109:05 p.m.SFO - BOS
1 stop9h 55mSouthwest
mar. 28/105:30 a.m.BOS - SFO
1 stop11h 00mSouthwest
Deal found 10/9C$ 294
mar. 7/109:05 p.m.SFO - BOS
1 stop8h 20mSouthwest
vie. 14/116:10 a.m.BOS - SFO
1 stop10h 55mSouthwest
Deal found 10/9C$ 299
sáb. 25/1010:55 a.m.SFO - BOS
1 stop9h 25mSouthwest
mar. 28/107:50 a.m.BOS - SFO
2 stops10h 10mSouthwest
Deal found 10/9C$ 301
mié. 5/1110:50 a.m.SFO - BOS
1 stop7h 50mSouthwest
mar. 11/116:45 a.m.BOS - SFO
1 stop10h 55mSouthwest
Deal found 11/9C$ 308
jue. 4/129:25 p.m.SFO - BOS
1 stop9h 15mSouthwest
lun. 8/127:20 a.m.BOS - SFO
1 stop9h 35mSouthwest
Deal found 11/9C$ 310
sáb. 1/115:30 p.m.SFO - BOS
2 stops12h 35mSouthwest
mar. 4/117:45 a.m.BOS - SFO
1 stop8h 35mSouthwest
Deal found 10/9C$ 317
mar. 21/109:05 p.m.SFO - BOS
1 stop8h 20mSouthwest
vie. 24/105:35 a.m.BOS - SFO
1 stop11h 50mSouthwest
Deal found 9/9C$ 320
lun. 20/109:05 p.m.SFO - BOS
1 stop8h 20mSouthwest
mié. 22/102:05 p.m.BOS - SFO
1 stop8h 45mSouthwest
Deal found 10/9C$ 324
vie. 12/129:25 p.m.SFO - BOS
1 stop7h 40mSouthwest
lun. 15/127:20 a.m.BOS - SFO
1 stop9h 35mSouthwest
Deal found 11/9C$ 327
mié. 5/1110:50 a.m.SFO - BOS
1 stop7h 50mSouthwest
dom. 9/115:15 a.m.BOS - SFO
1 stop8h 50mSouthwest
Deal found 10/9C$ 328
sáb. 13/129:25 p.m.SFO - BOS
1 stop7h 40mSouthwest
jue. 18/125:15 a.m.BOS - SFO
1 stop8h 50mSouthwest
Deal found 10/9C$ 331

Cheapflights Fare Finder

 
Customize 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 629,999 searches. Data last updated 11 septiembre 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

sáb. 1/11

10:55 a.m.-11:20 p.m.

1 stop9h 25m

Boston Logan Intl

mar. 4/11

2:10 p.m.-9:15 p.m.

2 stops10h 05m

C$ 371

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

vie. 31/10

1:00 p.m.-9:38 p.m.

Nonstop5h 38m

Boston Logan Intl

lun. 3/11

8:30 p.m.-12:24 a.m.

Nonstop6h 54m

C$ 387

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

sáb. 25/10

7:11 a.m.-4:00 p.m.

Nonstop5h 49m

Boston Logan Intl

sáb. 1/11

6:59 p.m.-10:50 p.m.

Nonstop6h 51m

C$ 387

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

lun. 27/10

7:00 a.m.-3:41 p.m.

Nonstop5h 41m

Boston Logan Intl

mar. 4/11

6:59 p.m.-10:50 p.m.

Nonstop6h 51m

C$ 387

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

mar. 14/10

9:50 p.m.-6:30 a.m.

Nonstop5h 40m

Boston Logan Intl

mar. 21/10

7:15 a.m.-11:02 a.m.

Nonstop6h 47m

C$ 387

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

lun. 20/10

3:50 p.m.-12:30 a.m.

Nonstop5h 40m

Boston Logan Intl

vie. 24/10

5:59 p.m.-9:53 p.m.

Nonstop6h 54m

C$ 387

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

dom. 5/10

7:05 a.m.-3:45 p.m.

Nonstop5h 40m

Boston Logan Intl

vie. 14/11

7:55 p.m.-11:53 p.m.

Nonstop6h 58m

C$ 387

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

vie. 31/10

12:10 p.m.-8:43 p.m.

Nonstop5h 33m

Boston Logan Intl

vie. 7/11

8:07 p.m.-11:54 p.m.

Nonstop6h 47m

C$ 387

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

sáb. 18/10

9:34 a.m.-11:59 p.m.

1 stop11h 25m

Boston Logan Intl

mar. 21/10

8:25 p.m.-12:05 a.m.

Nonstop6h 40m

C$ 389

San FranciscoBoston

SFO - BOS

SFOBOS

San Francisco

jue. 30/10

8:00 a.m.-11:11 p.m.

1 stop12h 11m

Boston Logan Intl

lun. 3/11

8:12 p.m.-11:59 p.m.

Nonstop6h 47m

C$ 389

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

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 round-trip 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 round-trip flight from San Francisco to Boston. Price data was last updated on 29 August 2025.

Booking 64 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, May is the cheapest month in which you can book a flight from San Francisco to Boston (average of C$ 292). Flying from San Francisco to Boston in April is currently the most expensive (average of C$ 350). 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 11 septiembre 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 54% on flights from San Francisco to Boston by exploring options for tickets in the morning.

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?

    Flights from San Francisco to Boston Logan Intl have been viewed 4 times in the past calendar month.

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

    A quick flight from San Francisco to Boston can take about 5h 38m. Southwest provides one of the quickest options available for as low as C$ 387. The distance from San Francisco to Boston is about 4339 km. Both multi-stop and direct flights can be found to your destination and back.

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

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as C$ 187. Users have also found prices from C$ 194 and C$ 194 on United Airlines and Hawaiian Airlines, respectively.

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

    Consider Etihad Airways (99%), China Eastern (92%) or Scandinavian Airlines (92%) when booking your flight. These represent the most reliable airlines when flying from San Francisco to Boston.

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

    On average you can expect to pay C$ 1,092 for a flight from San Francisco to Boston. The cheapest flight overall is C$ 164 while the most popular route, (San Francisco - Boston Logan Intl) is currently priced at C$ 421.

  • 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 vacation 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, May is the cheapest month in which you can book a flight from San Francisco to Boston (average of C$ 292). Flying from San Francisco to Boston in April is currently the most expensive (average of C$ 350). 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
Medford
Braintree
Waltham
Somerville
Rockland
Chelsea
Warwick
Milford
Plymouth
Quincy
Revere
Hampton
Old Orchard Beach
Lynn
Merrimack
Kennebunk
Watertown
Lawrence
Sturbridge
Seekonk

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Deals for San Francisco to Boston flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from San Francisco to Boston for you. Better yet — we are completely free to use.

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

Yes, we can. To see specific flights from San Francisco to Boston with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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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