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Cheap flights from Boston to San Francisco from £100

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
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in January or September, booked 83 days in advance, depart on a Wednesday or Friday and return on a Thursday

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 31 October 2025.

Round-trip from

£156

One-way from

£100

Popular in

December

Cheapest in

January

Average price

£297

Good round-trip deal

£352 or less

Good one-way deal

£234 or less
JetBlue
  • JetBlue
  • 8/12-8/1
  • 1 total stop
  • 14h 41m total
  • Boston to San Francisco
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Alaska Airlines
  • Alaska Airlines
  • 15/12
  • 1 total stop
  • 10h 24m total
  • Boston to San Francisco
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Highest demand for flights based on searches. 2% potential increase in price (£4 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 October 2025
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Price to beat on a round-trip flight from Boston Logan Intl to San Francisco.
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Price to beat on a one-way flight from Boston Logan Intl to San Francisco.
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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 31 October 2025.

Mon 8/1220:14BOS - SFO
Nonstop6h 45mJetBlue
Thu 8/122:40SFO - BOS
1 stop10h 35mJetBlue
Deal found 31/10£156
Thu 4/1218:52BOS - SFO
Nonstop6h 56mAlaska Airlines
Fri 12/1207:00SFO - BOS
1 stop7h 52mAlaska Airlines
Deal found 29/10£157
Thu 4/1205:40BOS - SFO
1 stop9h 05mJetBlue
Wed 10/1211:45SFO - BOS
Nonstop5h 34mJetBlue
Deal found 29/10£158
Thu 27/1107:05BOS - SFO
Nonstop6h 51mJetBlue
Sat 6/1221:16SFO - BOS
Nonstop5h 34mJetBlue
Deal found 29/10£159
Thu 20/1108:00BOS - SFO
Nonstop6h 54mUnited Airlines
Thu 4/1222:55SFO - BOS
Nonstop5h 41mUnited Airlines
Deal found 30/10£161
Wed 10/1216:24BOS - SFO
1 stop9h 24mAlaska Airlines
Fri 12/1207:00SFO - BOS
1 stop7h 52mAlaska Airlines
Deal found 29/10£164
Wed 19/1107:00BOS - SFO
1 stop9h 50mAlaska Airlines
Wed 3/1207:00SFO - BOS
Nonstop5h 37mAlaska Airlines
Deal found 30/10£168
Tue 9/1206:45BOS - SFO
Nonstop6h 48mJetBlue
Thu 25/1215:22SFO - BOS
Nonstop5h 33mJetBlue
Deal found 29/10£170
Sun 16/1120:05BOS - SFO
Nonstop6h 54mDelta
Sun 7/1212:40SFO - BOS
Nonstop5h 40mDelta
Deal found 28/10£172
Sun 23/1120:30BOS - SFO
Nonstop6h 54mUnited Airlines
Thu 27/1110:45SFO - BOS
Nonstop5h 39mUnited Airlines
Deal found 30/10£174

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 858,174 searches. Data last updated 31 October 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

Tue 9/12

05:40-11:45

1 stop9h 05m

San Francisco

Tue 9/12

21:00-07:42

1 stop7h 42m

£165

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 15/12

07:20-13:55

1 stop9h 35m

San Francisco

Wed 17/12

05:50-16:05

1 stop7h 15m

£165

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 10/2

10:05-17:13

1 stop10h 08m

San Francisco

Tue 10/2

20:30-05:01

Nonstop5h 31m

£168

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 29/1

16:20-22:47

1 stop9h 27m

San Francisco

Mon 2/2

10:12-17:44

1 stop28h 32m

£170

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 21/1

10:00-13:54

Nonstop6h 54m

San Francisco

Sun 25/1

10:51-00:16

1 stop10h 25m

£175

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 6/2

16:20-22:47

1 stop9h 27m

San Francisco

Mon 9/2

09:00-23:59

1 stop11h 59m

£178

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 21/11

06:00-09:45

Nonstop6h 45m

San Francisco

Fri 28/11

08:25-17:06

Nonstop5h 41m

£180

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 23/11

20:30-00:24

Nonstop6h 54m

San Francisco

Fri 28/11

08:25-17:06

Nonstop5h 41m

£180

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 28/1

07:00-10:59

Nonstop6h 59m

San Francisco

Sat 31/1

12:15-20:53

Nonstop5h 38m

£180

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 13/11

09:20-15:16

1 stop8h 56m

San Francisco

Mon 17/11

23:25-08:06

Nonstop5h 41m

£187

Flights are sorted by cheapest return flights first.

Deals found on 29/10

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 24 October 2025.

Booking 83 days in advance of your planned departure date is, on average, the best time to get cheap flights from Boston to San Francisco. 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 Boston to San Francisco?

Currently, March is the cheapest month in which you can book a flight from Boston to San Francisco (average of £74). Flying from Boston to San Francisco in May is currently the most expensive (average of £135). 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 31 October 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 72% on your trip compared to booking a flight in the afternoon.

How much does it cost for a return flight from Boston to San Francisco?

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated 31 October 2025.
Get a feel of what it's like to fly with JetBlue from Boston to San Francisco by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
JetBlue
7.2
Good
2,906 reviews
Check prices

Food

6.7

Boarding

7.4

Comfort

7.6

Overall

7.2

Entertainment

7.3

Crew

8.0

Reviews

1 / 20
10.0
Excellent

JACK,Sept 2025

JFK - MSY

I liked the professional services of the crew. Keep up the good work.
JetBlue
7.2
Good
2,906 reviews
JetBlue
7.2
Good
2,906 reviews
Check prices

Food

6.7

Boarding

7.4

Comfort

7.6

Overall

7.2

Entertainment

7.3

Crew

8.0

Reviews

1 / 20
10.0
Excellent

JACK,Sept 2025

JFK - MSY

I liked the professional services of the crew. Keep up the good work.

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.

  • What airports do I use to fly from Boston to San Francisco?

    You will need to book a flight from Boston Logan Intl to San Francisco if you want to fly from Boston to San Francisco. At least 1 airline has flights from Logan Intl (BOS) to San Francisco (SFO) on a regular basis. There are 16 flights to San Francisco from the Boston airport per day. If you manage to book one that is nonstop, then you can expect the flight time from BOS to SFO to be around 6h 56m.

  • How popular is this Boston to San Francisco flight route?

    Within the past month, 9 users have taken a look at flights from Boston Logan Intl to San Francisco.

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

    Departing from Boston to San Francisco will take you 9h 05m. Boston and San Francisco are separated by a distance of 2696 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Boston to San Francisco round-trip?

    Flying on JetBlue is currently your cheapest option to San Francisco, with prices starting at £149. You may be able to fly from Boston to San Francisco for 46% less than the average price by searching for this airline.

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

    The cheapet airlines for a one-way flight from Boston to San Francisco are Alaska Airlines (£100), United Airlines (£104), and Southwest (£112).

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Boston to San Francisco on time: Qantas Airways (100%), Air China (97%), ANA (91%).

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

    On average you can expect to pay £361 for a flight from Boston to San Francisco. The cheapest flight overall is £90 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at £142.

  • 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 £74). Flying from Boston to San Francisco in May is currently the most expensive (average of £135). 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
Santa Cruz
Newark
South San Francisco
Bodega Bay
Pacific Grove

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.
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Boston to Las Vegas flights
Boston to San Diego flights

Top airline flying from Boston to San Francisco

Discover the top airline that operate flights from Boston to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest£149Average£254FlexibilityNo cancel feeOn-time62%
Search JetBlue flights

Fly with Cheapflights

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

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Boston to San Francisco. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights helps you find that perfect flight to San Francisco from Boston by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Yes! Cheapflights helps users easily find flights from Boston to San Francisco with no change fees.

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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