How often are flights from Boston to San Francisco delayed?

About 17% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 175 minutes.

Which airline has the best punctuality record on Boston to San Francisco flights?

Over the past year, United Airlines have had the lowest number of delays on this route, with just 14% of flights being delayed.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

What is the most punctual flight time for Boston to San Francisco flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

How popular is this Boston to San Francisco flight route?

Within the past month, 4 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 6h 42m. Boston and San Francisco are separated by a distance of 2696 mi. All flights are typically direct.

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

Flying on JetBlue is currently your cheapest option to San Francisco, with prices starting at £179. Another option worth looking into is Delta, starting at £294 return. You may be able to fly from Boston to San Francisco for 38% less than the average price by searching for these airlines.

Weekly flight availability from Boston to San Francisco

The most flights from BOS to SFO are scheduled on a Wednesday (43 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (24 on average).

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.

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).

What are the cheapest flights from Boston to San Francisco?

On average you can expect to pay £390 for a flight from Boston to San Francisco. The cheapest flight overall is £136 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at £201.

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: United Airlines (87%), WestJet (87%), Air China (84%).

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 34 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 41m.

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.

£118+ Cheap Flights from Boston to San Francisco

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

Airfare is below average for this route at the moment. Boston to San Francisco flights typically cost between £416 and £242 in August. The cheapest return flight price found within the last 3 days was £227 on United Airlines (26 Aug-2 Sept).

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in January or September, booked 90 days in advance, depart on a Tuesday or Monday and return on a Thursday

Cheap flight deals from Boston to San Francisco

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

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 14 May 2026.

Wed 19/807:35

BOS

SFO

Nonstop6h 34m

Delta

Tue 25/807:00

SFO

BOS

Nonstop5h 45m

Delta

Deal found 13/5£227

Wed 27/507:20

BOS

SFO

1 stop9h 44m

Alaska Airlines

Wed 27/516:44

SFO

BOS

1 stop10h 00m

Alaska Airlines

Deal found 11/5£230

Tue 2/608:05

BOS

SFO

1 stop11h 56m

Alaska Airlines

Tue 9/616:44

SFO

BOS

1 stop10h 00m

Alaska Airlines

Deal found 11/5£231

Thu 4/608:05

BOS

SFO

1 stop9h 56m

Alaska Airlines

Sat 6/606:16

SFO

BOS

1 stop20h 28m

Alaska Airlines

Deal found 12/5£234

Fri 3/707:20

BOS

SFO

Nonstop6h 39m

Delta

Tue 14/715:00

SFO

BOS

Nonstop5h 41m

Delta

Deal found 13/5£238

Sat 13/606:00

BOS

SFO

Nonstop6h 27m

United Airlines

Wed 17/608:10

SFO

BOS

Nonstop5h 54m

United Airlines

Deal found 14/5£240

Tue 8/908:30

BOS

SFO

1 stop10h 30m

Alaska Airlines

Thu 17/917:15

SFO

BOS

1 stop9h 34m

Alaska Airlines

Deal found 11/5£240

Wed 3/607:20

BOS

SFO

1 stop9h 44m

Alaska Airlines

Wed 3/616:44

SFO

BOS

1 stop10h 00m

Alaska Airlines

Deal found 12/5£241

Wed 3/605:45

BOS

SFO

1 stop8h 15m

Southwest

Wed 10/610:50

SFO

BOS

1 stop9h 15m

Southwest

Deal found 13/5£242

Tue 8/908:30

BOS

SFO

1 stop10h 30m

Alaska Airlines

Sun 20/917:20

SFO

BOS

1 stop9h 29m

Alaska Airlines

Deal found 13/5£244

Wed 27/516:48

BOS

SFO

1 stop19h 30m

Alaska Airlines

Mon 1/607:40

SFO

BOS

1 stop19h 40m

Alaska Airlines

Deal found 13/5£245

Wed 1/705:45

BOS

SFO

1 stop8h 34m

United Airlines

Tue 7/723:05

SFO

BOS

Nonstop5h 56m

United Airlines

Deal found 13/5£247

Find flight deals from Boston to San Francisco

Round-trip from	£227
One-way from	£118
Popular in	April
Cheapest in	January
Average price	£305
Good round-trip deal	£441 or less
Good one-way deal	£136 or less

United Airlines
26/8-2/9
Nonstop
12h 19m total
Boston to San Francisco

Search Deals

Alaska Airlines
27/5
1 total stop
9h 41m total
Boston to San Francisco

Search Deals

Highest demand for flights based on searches. 7% potential increase in price (£16 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£4 potential savings vs. average return price).

Search Deals

Average for round-trip flights in May 2026

Search Deals

Price to beat on a round-trip flight from Boston Logan Intl to San Francisco.

Search Deals

Price to beat on a one-way flight from Boston Logan Intl to San Francisco.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 18/8

06:35-10:06

Nonstop6h 31m

San Francisco

Tue 25/8

22:17-07:00

Nonstop5h 43m

£227

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 1/6

21:15-00:57

Nonstop6h 42m

San Francisco

Tue 9/6

15:10-23:58

Nonstop5h 48m

£249

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 24/7

06:35-10:06

Nonstop6h 31m

San Francisco

Tue 28/7

22:17-07:00

Nonstop5h 43m

£261

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 2/6

19:07-22:49

Nonstop6h 42m

San Francisco

Tue 9/6

15:10-23:58

Nonstop5h 48m

£262

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 27/5

21:27-01:06

Nonstop6h 39m

San Francisco

Sat 30/5

15:10-23:58

Nonstop5h 48m

£274

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 15/7

16:25-22:30

1 stop9h 05m

San Francisco

Mon 20/7

18:10-08:00

2 stops10h 50m

£286

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 1/6

18:40-09:33

1 stop17h 53m

San Francisco

Tue 9/6

13:17-05:44

2 stops13h 27m

£288

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 3/10

07:00-10:57

Nonstop6h 57m

San Francisco

Sat 10/10

07:00-15:43

Nonstop5h 43m

£291

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 26/6

16:45-00:10

1 stop10h 25m

San Francisco

Fri 3/7

20:55-15:20

2 stops15h 25m

£308

Cheapest one-way

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 4/6

20:59-00:32

Nonstop6h 33m

£125

Flights are sorted by cheapest return flights first.

Deals found on 11/5

Showing 1-10 of 20 resultsSorted by cheapest first

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.

BOS-SFO

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

Prices

Airlines

Delays

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

Booking 89 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, January is the cheapest month in which you can book a flight from Boston to San Francisco (average of £251). Flying from Boston to San Francisco in April is currently the most expensive (average of £338). 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?

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 52% on your trip compared to booking a flight at midday.

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

Reviews of airlines servicing San Francisco

Get a feel of what it's like to fly with Delta and 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.

Delta

7.9

Good

8,453 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

7.9

Good

8,453 reviews

Delta

7.9

Good

8,453 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

JetBlue

7.2

Good

2,974 reviews

Delta

7.9

Good

8,453 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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 34 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 41m.
How popular is this Boston to San Francisco flight route?
Within the past month, 4 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 6h 42m. Boston and San Francisco are separated by a distance of 2696 mi. All flights are typically direct.
What are the cheapest airlines flying from Boston to San Francisco round-trip?
Flying on JetBlue is currently your cheapest option to San Francisco, with prices starting at £179. Another option worth looking into is Delta, starting at £294 return. You may be able to fly from Boston to San Francisco for 38% less than the average price by searching for these airlines.
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: United Airlines (87%), WestJet (87%), Air China (84%).
What are the cheapest flights from Boston to San Francisco?
On average you can expect to pay £390 for a flight from Boston to San Francisco. The cheapest flight overall is £136 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at £201.
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, January is the cheapest month in which you can book a flight from Boston to San Francisco (average of £251). Flying from Boston to San Francisco in April is currently the most expensive (average of £338). 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.

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Top 2 airlines flying from Boston to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	Cheapest£179	Average£390	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
Delta	Cheapest£294	Average£441	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights

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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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Cheap flights from Boston to San Francisco from £118

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Boston to San Francisco

Cheapest flights from Boston to San FranciscoExplore 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 14 May 2026.

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 14 May 2026.

Best flights from Boston to San FranciscoDiscover carefully curated flight deals from Boston to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 May 2026.

Discover carefully curated flight deals from Boston to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 May 2026.

Direct flights from Boston to San FranciscoExplore direct flight options from Boston to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 May 2026.

Explore direct flight options from Boston to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 May 2026.

Last-minute flights from Boston to San FranciscoDiscover last-minute flight deals from Boston to San Francisco. Data last updated 14 May 2026 and is based on user searches.

Discover last-minute flight deals from Boston to San Francisco. Data last updated 14 May 2026 and is based on user searches.

One-way flights from Boston to San FranciscoSearch for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated 14 May 2026.

Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated 14 May 2026.

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Use the filters below to find and compare flights from Boston to San Francisco that are best for you.

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.

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?

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

What is the cheapest time of day to fly from BOS to SFO?

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

Weekly flight availability from Boston to San Francisco

How often are flights from Boston to San Francisco delayed?

What is the most punctual flight time for Boston to San Francisco flights?

What day of the week experiences the fewest flight delays on this route?

Which airline has the best punctuality record on Boston to San Francisco flights?

Reviews of airlines servicing San Francisco

Get a feel of what it's like to fly with Delta and 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.

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?

How popular is this Boston to San Francisco flight route?

How long is the flight from Boston to San Francisco?

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

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

What are the cheapest flights from Boston to San Francisco?

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

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

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

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

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Boston and San Francisco flights

Browse other Boston and San Francisco flight options. Last updated on 14 May 2026.

Other flights from Boston

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Top 2 airlines flying from Boston to San Francisco

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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 14 May 2026.

Best flights from Boston to San Francisco
Discover carefully curated flight deals from Boston to San Francisco that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 May 2026.

Direct flights from Boston to San Francisco
Explore direct flight options from Boston to San Francisco based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 May 2026.

Last-minute flights from Boston to San Francisco
Discover last-minute flight deals from Boston to San Francisco. Data last updated 14 May 2026 and is based on user searches.

One-way flights from Boston to San Francisco
Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated 14 May 2026.