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 often are flights from Boston to San Francisco delayed?

About 18% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 172 minutes.

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.

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.

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 31m. Boston and San Francisco are separated by a distance of 2696 mi. This flight may include one or multiple stops.

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 £183. Another option worth looking into is Delta, starting at £426 return. You may be able to fly from Boston to San Francisco for 40% 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 Friday (48 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (37 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 £484 for a flight from Boston to San Francisco. The cheapest flight overall is £162 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at £224.

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 (94%), ANA (85%), Korean Air (85%).

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 41 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.

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.

£128+ 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 £248 and £401 in July. The cheapest return flight price found within the last 3 days was £232 on United Airlines (28 Jul-4 Aug).

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in January or September, booked 46 days in advance, depart on a Wednesday or Monday and return on a Monday

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 28 June 2026.

Tue 28/706:00

BOS

SFO

Nonstop6h 27m

United Airlines

Tue 4/818:56

SFO

BOS

1 stop8h 02m

United Airlines

Deal found 28/6£232

Thu 16/720:55

BOS

SFO

Nonstop6h 38m

Delta

Mon 20/722:10

SFO

BOS

Nonstop5h 35m

Delta

Deal found 23/6£233

Wed 12/817:05

BOS

SFO

Nonstop6h 46m

Delta

Tue 18/809:30

SFO

BOS

1 stop11h 21m

Delta

Deal found 25/6£234

Tue 18/820:55

BOS

SFO

Nonstop6h 35m

JetBlue

Sun 13/921:45

SFO

BOS

Nonstop5h 47m

JetBlue

Deal found 25/6£236

Tue 18/820:55

BOS

SFO

Nonstop6h 35m

JetBlue

Tue 25/806:00

SFO

BOS

1 stop9h 59m

JetBlue

Deal found 28/6£236

Sat 11/706:00

BOS

SFO

Nonstop6h 27m

United Airlines

Fri 28/813:15

SFO

BOS

1 stop7h 44m

United Airlines

Deal found 26/6£237

Tue 21/706:00

BOS

SFO

Nonstop6h 27m

United Airlines

Tue 22/908:12

SFO

BOS

Nonstop5h 55m

United Airlines

Deal found 26/6£239

Mon 13/709:50

BOS

SFO

Nonstop6h 33m

JetBlue

Sat 25/715:18

SFO

BOS

Nonstop5h 41m

JetBlue

Deal found 27/6£239

Thu 20/815:50

BOS

SFO

Nonstop6h 32m

JetBlue

Wed 9/921:45

SFO

BOS

Nonstop5h 47m

JetBlue

Deal found 26/6£240

Fri 21/816:30

BOS

SFO

1 stop11h 08m

JetBlue

Thu 10/911:45

SFO

BOS

Nonstop5h 49m

JetBlue

Deal found 26/6£241

Fri 10/719:05

BOS

SFO

Nonstop6h 41m

JetBlue

Sat 18/706:00

SFO

BOS

1 stop9h 59m

JetBlue

Deal found 26/6£242

Fri 17/706:00

BOS

SFO

Nonstop6h 27m

United Airlines

Sun 19/716:15

SFO

BOS

Nonstop5h 56m

United Airlines

Deal found 24/6£242

Find flight deals from Boston to San Francisco

Round-trip from	£232
One-way from	£128
Popular in	June
Cheapest in	January
Average price	£349
Good round-trip deal	£441 or less
Good one-way deal	£165 or less

United Airlines
28/7-4/8
1 total stop
14h 29m total
Boston to San Francisco

Search Deals

Southwest
15/8
1 total stop
13h 55m total
Boston to San Francisco

Search Deals

Highest demand for flights based on searches. 6% potential increase in price (£15 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 June 2026

Search Deals

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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Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 16/7

07:20-10:51

Nonstop6h 31m

San Francisco

Sun 19/7

22:10-06:45

Nonstop5h 35m

£233

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 25/8

17:20-20:56

Nonstop6h 36m

San Francisco

Wed 26/8

12:30-21:18

Nonstop5h 48m

£239

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 11/8

05:35-10:35

1 stop8h 00m

San Francisco

Thu 13/8

12:30-00:25

1 stop8h 55m

£239

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 11/7

07:28-10:55

Nonstop6h 27m

San Francisco

Mon 13/7

22:38-09:29

1 stop7h 51m

£240

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 19/8

20:55-00:30

Nonstop6h 35m

San Francisco

Wed 26/8

10:59-00:32

1 stop10h 33m

£246

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 12/7

09:50-13:23

Nonstop6h 33m

San Francisco

Tue 14/7

12:30-21:18

Nonstop5h 48m

£248

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 19/8

05:25-11:35

1 stop9h 10m

San Francisco

Wed 26/8

19:10-09:50

2 stops11h 40m

£267

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 7/10

07:45-11:15

Nonstop6h 30m

San Francisco

Sun 11/10

23:20-08:16

Nonstop5h 56m

£267

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 10/7

06:35-10:05

Nonstop6h 30m

San Francisco

Sat 18/7

06:00-14:41

Nonstop5h 41m

£279

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 6/8

06:00-09:27

Nonstop6h 27m

San Francisco

Wed 12/8

14:07-22:59

Nonstop5h 52m

£280

Flights are sorted by cheapest return flights first.

Deals found on 25/6

Showing 1-10 of 21 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 45 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 £257). Flying from Boston to San Francisco in June is currently the most expensive (average of £348). 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

7.8

Good

8,455 reviews

Check prices

Reviews

1 / 20

6.0

Good

Cidalia,Aug 2023

BOS - MIA

I like Delta overall but the delays lately without justification are not leaving a good impression. Both flights were delayed for over 2 hours

Delta

7.8

Good

8,455 reviews

Delta

7.8

Good

8,455 reviews

Check prices

Reviews

1 / 20

6.0

Good

Cidalia,Aug 2023

BOS - MIA

I like Delta overall but the delays lately without justification are not leaving a good impression. Both flights were delayed for over 2 hours

JetBlue

7.1

Good

3,012 reviews

Delta

7.8

Good

8,455 reviews

Check prices

Reviews

1 / 20

6.0

Good

Cidalia,Aug 2023

BOS - MIA

I like Delta overall but the delays lately without justification are not leaving a good impression. Both flights were delayed for over 2 hours

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 41 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?
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 31m. Boston and San Francisco are separated by a distance of 2696 mi. This flight may include one or multiple stops.
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 £183. Another option worth looking into is Delta, starting at £426 return. You may be able to fly from Boston to San Francisco for 40% 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: Air China (94%), ANA (85%), Korean Air (85%).
What are the cheapest flights from Boston to San Francisco?
On average you can expect to pay £484 for a flight from Boston to San Francisco. The cheapest flight overall is £162 while the most popular route, (Boston Logan Intl - San Francisco) is currently priced at £224.
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 £257). Flying from Boston to San Francisco in June is currently the most expensive (average of £348). 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£183	Average£414	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
Delta	Cheapest£426	Average£494	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 £128

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 15/8. 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 28 June 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 28 June 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 28 June 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 28 June 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 28 June 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 28 June 2026.

Last-minute flights from Boston to San FranciscoDiscover last-minute flight deals from Boston to San Francisco. Data last updated 28 June 2026 and is based on user searches.

Discover last-minute flight deals from Boston to San Francisco. Data last updated 28 June 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 28 June 2026.

Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated 28 June 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 28 June 2026.

Other flights from Boston

Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on 28 June 2026.

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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 28 June 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 28 June 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 28 June 2026.

Last-minute flights from Boston to San Francisco
Discover last-minute flight deals from Boston to San Francisco. Data last updated 28 June 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 28 June 2026.