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Cheap flights from Boston to San Francisco from £89

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 21/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
4 May — 11 May1
1 adult

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in September or January, booked 56 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

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 29 April 2025.

Round-trip from

£170

One-way from

£89

Popular in

June

Cheapest in

September

Average price

£290
Alaska Airlines
  • Alaska Airlines
  • 28/5-7/6
  • 1 total stop
  • 25h 55m total
  • Boston to San Francisco
United Airlines
  • United Airlines
  • 21/5
  • Nonstop
  • 6h 40m total
  • Boston to San Francisco
Highest demand for flights based on searches. 6% potential increase in price (£15 potential increase over avg. return price).
Cheapest flight prices on average. 1% potential price decrease (£4 potential savings vs. average return price).
Average for round-trip flights in April 2025

Find flight deals from Boston to San Francisco

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 29 April 2025.

Wed 28/519:59BOS - SFO
Nonstop6h 45mAlaska Airlines
Sat 7/608:00SFO - BOS
1 stop19h 10mAlaska Airlines
Deal found 29/4£170
Wed 21/506:05BOS - SFO
Nonstop6h 40mUnited Airlines
Sat 24/523:20SFO - BOS
Nonstop5h 48mUnited Airlines
Deal found 27/4£177
Thu 29/507:00BOS - SFO
Nonstop6h 49mHawaiian Airlines
Sat 31/520:47SFO - BOS
Nonstop5h 53mHawaiian Airlines
Deal found 29/4£186
Wed 16/706:05BOS - SFO
Nonstop6h 39mJetBlue
Wed 16/713:30SFO - BOS
Nonstop5h 44mJetBlue
Deal found 28/4£190
Sat 7/616:48BOS - SFO
1 stop9h 05mAmerican Airlines
Sat 14/605:25SFO - BOS
1 stop9h 21mAmerican Airlines
Deal found 28/4£192
Thu 12/620:31BOS - SFO
Nonstop6h 52mDelta
Thu 19/622:00SFO - BOS
Nonstop5h 44mDelta
Deal found 28/4£238
Tue 12/805:20BOS - SFO
2 stops9h 50mSouthwest
Thu 21/811:25SFO - BOS
1 stop8h 35mSouthwest
Deal found 28/4£242

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 29 April 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

Wed 28/5

19:59-23:44

Nonstop6h 45m

San Francisco

Sat 7/6

08:00-06:10

1 stop19h 10m

£170

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 21/5

07:00-10:49

Nonstop6h 49m

San Francisco

Sat 24/5

20:47-05:40

Nonstop5h 53m

£177

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 16/7

06:05-09:44

Nonstop6h 39m

San Francisco

Wed 16/7

13:30-22:14

Nonstop5h 44m

£190

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 7/6

16:48-22:53

1 stop9h 05m

San Francisco

Sat 14/6

05:25-17:46

1 stop9h 21m

£192

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 3/7

10:32-14:03

Nonstop6h 31m

San Francisco

Mon 7/7

19:03-06:01

1 stop7h 58m

£201

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 12/6

20:31-00:23

Nonstop6h 52m

San Francisco

Thu 19/6

22:00-06:44

Nonstop5h 44m

£238

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 12/8

05:20-12:10

2 stops9h 50m

San Francisco

Tue 26/8

11:25-22:30

1 stop8h 05m

£242

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 23/6

06:30-22:53

1 stop19h 23m

San Francisco

Thu 26/6

23:59-23:33

1 stop20h 34m

£307

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 21/5

07:00-10:49

Nonstop6h 49m

£89

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 25/5

06:00-09:33

Nonstop6h 33m

£97

Flights are sorted by cheapest return flights first.

Deals found on 28/4

Showing 1-10 of 15 results
1
2

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 25 April 2025.

Booking 56 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, February is the cheapest month in which you can book a flight from Boston to San Francisco (average of £538). Flying from Boston to San Francisco in July is currently the most expensive (average of £803). 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 29 April 2025.

A simple way to save on the total cost of your ticket is to fly from Boston to San Francisco at midday. If you’re flexible enough to do this you can expect to save up to 22% on your trip compared to booking a flight in the morning.

Weekly flight availability from Boston to San Francisco

Explore weekly flight availability from Boston to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 29 April 2025.

The most flights from BOS to SFO are scheduled on a Monday (49 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 on average).

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 inches per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

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 29 April 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from Boston to San Francisco have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
8.0
Very Good

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Boarding

8.2

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 2 different airlines have flights from Logan Intl (BOS) to San Francisco (SFO) on a regular basis. There are 39 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 31m.

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

  • What are the cheapest airlines flying from Boston to San Francisco round-trip?

    Flying on Alaska Airlines is currently your cheapest option to San Francisco, with prices starting at £170. Additional return tickets that might be worth considering are offered by Hawaiian Airlines and JetBlue, with the lowest prices starting at £177 and £190, respectively. You may be able to fly from Boston to San Francisco for 36% less than the average price by searching for these airlines.

  • 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 United Airlines (£89), Alaska Airlines (£95), and Hawaiian Airlines (£97).

  • 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: Air China (95%), Scandinavian Airlines (91%), Delta (87%).

  • 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, February is the cheapest month in which you can book a flight from Boston to San Francisco (average of £538). Flying from Boston to San Francisco in July is currently the most expensive (average of £803). 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
Santa Cruz
Los Banos
Vallejo
Newark
South San Francisco
Pacific Grove
Union City

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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.

Top 2 airlines flying from Boston to San Francisco

Discover the top 2 airlines 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 29 April 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest£107Average£182FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Alaska AirlinesCheapest£165Average£289FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines 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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