How often are flights from Boston to San Francisco delayed?

About 23% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 169 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 20% of flights being delayed.

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

Saturday 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 at night 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, 1 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 47m. 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 £180. Another option worth looking into is Delta, starting at £387 return. You may be able to fly from Boston to San Francisco for 43% 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 JetBlue (£76), Delta (£126), and United Airlines (£170).

Weekly flight availability from Boston to San Francisco

The most flights from BOS to SFO are scheduled on a Sunday (44 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (16 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 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 (86%), Korean Air (78%), WestJet (76%).

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 24 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 47m.

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.

£136+ Cheap Flights from Boston to San Francisco

Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in January or March, booked 86 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 9 November 2026.

Fri 4/1205:45 -

1 stop9h 22m

Fri 4/1221:00 -

1 stop11h 12m

Deal found 7/11£239

Sun 13/1208:00 -

Nonstop6h 52m

Sun 13/1221:00 -

1 stop11h 57m

Deal found 7/11£241

Tue 15/1218:13 -

1 stop26h 53m

Tue 22/1221:36 -

1 stop28h 52m

Deal found 8/11£242

Thu 3/1220:25 -

Nonstop6h 56m

Wed 9/1207:00 -

Nonstop5h 34m

Deal found 8/11£242

Wed 2/1220:25 -

Nonstop6h 56m

Sat 5/1207:00 -

Nonstop5h 34m

Deal found 5/11£244

Wed 9/1215:45 -

Nonstop6h 47m

Sat 12/1223:45 -

Nonstop5h 34m

Deal found 4/11£245

Thu 17/1207:40 -

1 stop28h 12m

Wed 6/116:29 -

1 stop10h 11m

Deal found 4/11£246

Wed 9/1218:13 -

1 stop30h 07m

Wed 16/1206:00 -

1 stop8h 09m

Deal found 8/11£247

Fri 4/1218:13 -

1 stop17h 43m

Thu 10/1210:40 -

1 stop10h 19m

Deal found 8/11£248

Wed 2/1207:30 -

Nonstop6h 53m

Tue 8/1212:45 -

1 stop8h 14m

Deal found 8/11£248

Thu 10/1216:56 -

1 stop9h 33m

Fri 11/1217:35 -

1 stop20h 33m

Deal found 7/11£250

Thu 19/1116:50 -

Nonstop6h 49m

Thu 26/1112:55 -

Nonstop5h 28m

Deal found 5/11£251

Find flight deals from Boston to San Francisco

Round-trip from	£239
One-way from	£136
Popular in	December
Cheapest in	January
Average price	£344

Alaska Airlines
6/1-25/1
2 total stops
35h 17m total
Boston to San Francisco

Search Deals

Delta
14/12-31/12
Nonstop
6h 56m total
Boston to San Francisco

Search Deals

High demand for flights, 0% potential price rise

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£3 potential savings vs. average return price).

Search Deals

Average for round-trip flights in November 2026

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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 11/12

18:13-08:56

1 stop17h 43m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£136

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 20/11

07:50-11:41

Nonstop6h 51m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£151

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Wed 27/1

08:10-16:05

2 stops10h 55m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£152

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 27/11

06:00-11:50

1 stop8h 50m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£159

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Tue 24/11

05:25-13:30

1 stop11h 05m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£159

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Sat 27/2

13:55-22:40

2 stops11h 45m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£171

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 8/1

05:45-16:36

2 stops13h 51m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£175

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Thu 17/12

07:25-13:45

1 stop9h 20m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£178

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Tue 13/4

19:55-23:52

Nonstop6h 57m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£182

Fastest return journey

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Thu 22/4

11:10-14:53

Nonstop6h 43m

San Francisco

Wed 31/12

00:00-03:00

Nonstop0h 00m

£182

Flights are sorted by cheapest return flights first.

Deals found on 9/11

Showing 1-10 of 19 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 85 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 £260). Flying from Boston to San Francisco in December is currently the most expensive (average of £359). 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?

Airfare is below average for this route at the moment.

Boston to San Francisco flights typically cost between £269 and £461 in January.
The cheapest return price found within the last 5 days was £239 on Alaska Airlines (6 Jan–25 Jan).

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

8,700 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

8,700 reviews

Delta

7.8

Good

8,700 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

3,067 reviews

Delta

7.8

Good

8,700 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 24 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 47m.
How popular is this Boston to San Francisco flight route?
Within the past month, 1 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 47m. 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 £180. Another option worth looking into is Delta, starting at £387 return. You may be able to fly from Boston to San Francisco for 43% 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 JetBlue (£76), Delta (£126), and United Airlines (£170).
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 (86%), Korean Air (78%), WestJet (76%).
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 £260). Flying from Boston to San Francisco in December is currently the most expensive (average of £359). 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

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Top 2 airlines flying from Boston to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	Cheapest£180	Average£393	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
Delta	Cheapest£387	Average£445	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights

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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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Cheap flights from Boston to San Francisco from £136

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/12. 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 9 November 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 9 November 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 9 November 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 9 November 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 9 November 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 9 November 2026.

Last-minute flights from Boston to San FranciscoDiscover last-minute flight deals from Boston to San Francisco. Data last updated 9 November 2026 and is based on user searches.

Discover last-minute flight deals from Boston to San Francisco. Data last updated 9 November 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 9 November 2026.

Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated 9 November 2026.

Find flight deals from Boston to San Francisco

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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

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

Booking 85 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?

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?

Airfare is below average for this route at the moment.

Boston to San Francisco flights typically cost between £269 and £461 in January.The cheapest return price found within the last 5 days was £239 on Alaska Airlines (6 Jan–25 Jan).

Weekly flight availability from Boston to San Francisco

The most flights from BOS to SFO are scheduled on a Sunday (44 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (16 on average).

How often are flights from Boston to San Francisco delayed?

About 23% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 169 minutes.

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

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

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

Saturday 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 20% of flights being delayed.

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

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 cheapest airlines to fly from Boston to San Francisco one-way?

What are the most reliable airlines 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?

Travelling to a place near San Francisco?

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Alternative routes for Boston to San Francisco

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Complete your trip

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Search flights from Boston to San Francisco by cabin class

Find flights from Boston to San Francisco, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Boston and San Francisco flights

Browse other Boston and San Francisco flight options. Last updated on 9 November 2026.

Other flights from Boston

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Other flights to San Francisco

Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 9 November 2026.

Top 2 airlines flying from Boston to San Francisco

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

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

Can Cheapflights 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?

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 9 November 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 9 November 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 9 November 2026.

Last-minute flights from Boston to San Francisco
Discover last-minute flight deals from Boston to San Francisco. Data last updated 9 November 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 9 November 2026.

Boston to San Francisco flights typically cost between £269 and £461 in January.
The cheapest return price found within the last 5 days was £239 on Alaska Airlines (6 Jan–25 Jan).