How often are flights from Boston to San Francisco delayed?

About 21% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 173 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 18% of flights being delayed.

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?

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.

How popular is this Boston to San Francisco flight route?

Flights from Boston Logan Intl to San Francisco have been viewed 2 times in the past calendar month.

How long is the flight from Boston to San Francisco?

Departing from Boston to San Francisco will take you 6h 29m. The distance between Boston and San Francisco is about 4339 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

Weekly flight availability from Boston to San Francisco

The most flights from BOS to SFO are scheduled on a Monday (53 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 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?

While on average a flight from Boston to San Francisco is generally $1,430, our data shows the cheapest flight currently is $1,430. When looking at the most popular route, (Boston Logan Intl - San Francisco), you can expect to pay $460 for that flight.

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

The top 3 most reliable airlines when flying from Boston to San Francisco are ANA (84%), Air China (83%) and LATAM Airlines (81%).

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.

$229+ Cheap Flights from Boston to San Francisco

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 26 August 2026.

Fri 2/1012:54 -

1 stop9h 54m

Tue 20/1010:30 -

Nonstop5h 47m

Deal found 22/8$415

Sat 12/907:35 -

Nonstop6h 29m

Sat 19/915:00 -

Nonstop5h 46m

Deal found 21/8$443

Sat 19/906:50 -

Nonstop6h 23m

Sat 26/922:10 -

Nonstop5h 50m

Deal found 24/8$444

Sat 19/907:45 -

Nonstop6h 30m

Sat 26/912:45 -

1 stop8h 14m

Deal found 25/8$451

Fri 2/1006:50 -

Nonstop6h 23m

Mon 5/1022:05 -

1 stop11h 02m

Deal found 24/8$453

Wed 7/1007:45 -

Nonstop6h 30m

Wed 14/1022:42 -

1 stop7h 51m

Deal found 25/8$457

Wed 21/1007:03 -

1 stop12h 05m

Tue 27/1016:43 -

1 stop9h 45m

Deal found 26/8$461

Sat 5/1207:08 -

1 stop11h 41m

Sat 5/1218:53 -

1 stop10h 09m

Deal found 23/8$465

Fri 9/1021:29 -

Nonstop6h 30m

Fri 16/1022:14 -

1 stop9h 33m

Deal found 25/8$468

Tue 15/917:15 -

Nonstop6h 30m

Tue 22/907:10 -

Nonstop5h 47m

Deal found 26/8$471

Wed 18/1109:30 -

Nonstop6h 50m

Wed 25/1113:00 -

Nonstop5h 40m

Deal found 22/8$472

Find flight deals from Boston to San Francisco

Round-trip from	$415
One-way from	$229
Popular in	June
Cheapest in	January
Average price	$588
Good one-way deal	$1,430 or less

JetBlue
2/10-20/10
1 total stop
15h 41m total
Boston to San Francisco

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United Airlines
27/10
1 total stop
11h 14m total
Boston to San Francisco

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Highest demand for flights based on searches. 4% potential increase in price ($37 potential increase over avg. return price).

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Cheapest flight prices on average. 1% potential price decrease ($10 potential savings vs. average return price).

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Average for round-trip flights in August 2026

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

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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

Sun 20/9

07:35-11:04

Nonstop6h 29m

San Francisco

Sat 26/9

15:00-23:46

Nonstop5h 46m

$471

Fastest return journey

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 2/10

07:35-11:04

Nonstop6h 29m

San Francisco

Tue 20/10

12:40-21:20

Nonstop5h 40m

$471

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 2/10

20:55-00:22

Nonstop6h 27m

San Francisco

Mon 5/10

15:00-23:46

Nonstop5h 46m

$499

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Wed 7/10

07:45-11:25

Nonstop6h 40m

San Francisco

Wed 14/10

15:00-23:39

Nonstop5h 39m

$513

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 18/9

07:12-14:49

1 stop10h 37m

San Francisco

Mon 21/9

07:08-05:47

1 stop19h 39m

$520

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 9/10

21:29-00:59

Nonstop6h 30m

San Francisco

Fri 16/10

14:37-23:58

Nonstop6h 21m

$527

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Tue 6/10

05:15-10:50

1 stop8h 35m

San Francisco

Tue 13/10

18:50-08:50

2 stops11h 00m

$527

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Thu 5/11

05:10-12:25

1 stop10h 15m

San Francisco

Mon 9/11

18:00-08:20

2 stops11h 20m

$534

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Fri 2/10

18:35-00:05

1 stop8h 30m

San Francisco

Tue 20/10

18:50-08:50

2 stops11h 00m

$534

BostonSan Francisco

BOS Boston Logan Intl - SFO San Francisco

BOSSFO

Boston Logan Intl

Sat 5/12

05:25-13:05

2 stops10h 40m

San Francisco

Wed 9/12

21:25-08:20

1 stop7h 55m

$537

Flights are sorted by cheapest return flights first.

Deals found on 25/8

Showing 1-10 of 24 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?

The price you pay for your flight from Boston to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 40 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 $474). Flying from Boston to San Francisco in June is currently the most expensive (average of $646). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Boston to San Francisco as you normally would.

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 $469 and $733 in October.
The cheapest return price found within the last 5 days was $415 on Multiple Airlines (2 Oct–20 Oct).

Related info for your journey

How popular is this Boston to San Francisco flight route?
Flights from Boston Logan Intl to San Francisco have been viewed 2 times in the past calendar month.
How long is the flight from Boston to San Francisco?
Departing from Boston to San Francisco will take you 6h 29m. The distance between Boston and San Francisco is about 4339 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the most reliable airlines from Boston to San Francisco?
The top 3 most reliable airlines when flying from Boston to San Francisco are ANA (84%), Air China (83%) and LATAM Airlines (81%).
What are the cheapest flights from Boston to San Francisco?
While on average a flight from Boston to San Francisco is generally $1,430, our data shows the cheapest flight currently is $1,430. When looking at the most popular route, (Boston Logan Intl - San Francisco), you can expect to pay $460 for that flight.
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 $474). Flying from Boston to San Francisco in June is currently the most expensive (average of $646). 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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Cheapflights helps you search for flights from Boston to San Francisco via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Boston to San Francisco for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Boston to San Francisco flexibly with Cheapflights today.

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 $229

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 27/10. 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 26 August 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 26 August 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 26 August 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 26 August 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 26 August 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 26 August 2026.

Last-minute flights from Boston to San FranciscoDiscover last-minute flight deals from Boston to San Francisco. Data last updated 26 August 2026 and is based on user searches.

Discover last-minute flight deals from Boston to San Francisco. Data last updated 26 August 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 26 August 2026.

Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated 26 August 2026.

Find flight deals from Boston to San Francisco

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One-way from

Popular in

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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.

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?

The price you pay for your flight from Boston to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 40 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Boston to San Francisco as you normally would.

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 $469 and $733 in October.The cheapest return price found within the last 5 days was $415 on Multiple Airlines (2 Oct–20 Oct).

Weekly flight availability from Boston to San Francisco

The most flights from BOS to SFO are scheduled on a Monday (53 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 on average).

How often are flights from Boston to San Francisco delayed?

About 21% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 173 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?

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 18% of flights being delayed.

Related info for your journey

How popular is this Boston to San Francisco flight route?

How long is the flight from Boston to San Francisco?

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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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?

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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 26 August 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 26 August 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 26 August 2026.

Last-minute flights from Boston to San Francisco
Discover last-minute flight deals from Boston to San Francisco. Data last updated 26 August 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 26 August 2026.

Boston to San Francisco flights typically cost between $469 and $733 in October.
The cheapest return price found within the last 5 days was $415 on Multiple Airlines (2 Oct–20 Oct).