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

Over the past year, United Airlines has had the lowest number of delays on this route, with just 13% of flights being delayed.

How often are flights from Boston to San Francisco delayed?

About 16% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 177 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 Sunday 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?

Flights from Boston Logan Intl to San Francisco have been viewed 5 times in the past calendar month.

How long is the flight from Boston to San Francisco?

For as low as C$ 447, United Airlines can have you in San Francisco from Boston in 6h 27m. Airlines will cover a distance of 4339 km. This flight may include one or multiple stops.

What is the cheapest airline to fly from Boston to San Francisco round-trip?

Cheapflights users have booked flights from Boston to San Francisco round-trip from C$ 162. JetBlue is 69% cheaper than the average price of flights available within the next 90 days to this destination.

Weekly flight availability from Boston to San Francisco

The most flights from BOS to SFO are scheduled on a Sunday (41 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (2 on average).

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 mm 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?

No one likes to see their flight delayed. When booking a flight from Boston to San Francisco consider choosing WestJet (88%), Japan Airlines (79%) or United Airlines (78%) as they are the most reliable in getting you off to your destination on time.

What airports do I use to fly from Boston to San Francisco?

If you wish to fly to San Francisco from Boston, then you need to book flights from Boston Logan Intl to San Francisco. There are 27 flights from Logan Intl (BOS) to San Francisco (SFO) per day to choose from. Flights to San Francisco from Logan Intl are available from 1 airline, which means you should have some options if you want to compare airfare deals. 6h 33m is how long a nonstop flight from Boston to San Francisco typically takes.

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 vacation 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.

C$ 202+ Cheap Flights from Boston to San Francisco

Q: How much does it cost to fly round-trip from Boston to San Francisco?

Airfare is below average for this route at the moment. Boston to San Francisco flights typically cost between C$ 686 and C$ 406 in August. The cheapest round-trip price found within the last 3 days was C$ 395 on Southwest (4 Aug-11 Aug).

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 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 27 April 2026.

Tue 4/85:35 a.m.

BOS

SFO

1 stop8h 00m

Southwest

Tue 11/86:00 p.m.

SFO

BOS

1 stop9h 00m

Southwest

Deal found 22/4C$ 395

Tue 2/68:05 a.m.

BOS

SFO

1 stop11h 56m

Alaska Airlines

Tue 9/66:16 a.m.

SFO

BOS

1 stop20h 28m

Alaska Airlines

Deal found 22/4C$ 396

Tue 18/87:55 a.m.

BOS

SFO

Nonstop6h 35m

JetBlue

Tue 18/83:19 p.m.

SFO

BOS

Nonstop5h 40m

JetBlue

Deal found 25/4C$ 399

Wed 19/88:15 a.m.

BOS

SFO

2 stops11h 10m

Southwest

Sat 29/89:25 a.m.

SFO

BOS

1 stop7h 25m

Southwest

Deal found 22/4C$ 402

Wed 27/56:40 p.m.

BOS

SFO

1 stop17h 53m

Alaska Airlines

Sat 30/56:58 p.m.

SFO

BOS

1 stop8h 22m

Alaska Airlines

Deal found 23/4C$ 406

Sat 23/57:13 a.m.

BOS

SFO

Nonstop6h 40m

JetBlue

Sat 30/53:10 p.m.

SFO

BOS

Nonstop5h 48m

JetBlue

Deal found 22/4C$ 407

Thu 4/68:05 a.m.

BOS

SFO

1 stop17h 18m

Alaska Airlines

Wed 10/67:55 a.m.

SFO

BOS

1 stop18h 45m

Alaska Airlines

Deal found 23/4C$ 409

Tue 12/55:56 p.m.

BOS

SFO

1 stop18h 37m

Alaska Airlines

Sat 16/56:16 a.m.

SFO

BOS

1 stop20h 28m

Alaska Airlines

Deal found 23/4C$ 410

Tue 26/56:40 p.m.

BOS

SFO

1 stop17h 53m

Alaska Airlines

Fri 29/56:16 a.m.

SFO

BOS

1 stop20h 28m

Alaska Airlines

Deal found 23/4C$ 413

Wed 27/56:40 p.m.

BOS

SFO

1 stop23h 21m

Alaska Airlines

Tue 9/66:16 a.m.

SFO

BOS

1 stop20h 28m

Alaska Airlines

Deal found 22/4C$ 414

Tue 9/63:45 p.m.

BOS

SFO

2 stops10h 30m

Southwest

Tue 16/68:55 a.m.

SFO

BOS

1 stop11h 05m

Southwest

Deal found 22/4C$ 417

Fri 3/77:20 a.m.

BOS

SFO

Nonstop6h 39m

Delta

Tue 25/82:50 p.m.

SFO

BOS

Nonstop5h 51m

Delta

Deal found 26/4C$ 420

Find flight deals from Boston to San Francisco

Round-trip from	C$ 395
One-way from	C$ 202
Popular in	April
Cheapest in	January
Average price	C$ 649

Southwest
4/8-11/8
2 total stops
17h 00m total
Boston to San Francisco

Search Deals

JetBlue
30/5
Nonstop
6h 43m total
Boston to San Francisco

Search Deals

Highest demand for flights based on searches. 7% potential increase in price (C$ 54 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (C$ 16 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 1/7

6:00 a.m.-9:27 a.m.

Nonstop6h 27m

San Francisco

Wed 8/7

12:25 p.m.-9:21 p.m.

Nonstop5h 56m

C$ 447

Quickest round-trip

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 6/9

6:35 a.m.-10:06 a.m.

Nonstop6h 31m

San Francisco

Sat 12/9

1:00 p.m.-9:47 p.m.

Nonstop5h 47m

C$ 495

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sat 23/5

7:11 p.m.-11:00 a.m.

1 stop18h 49m

San Francisco

Sat 30/5

6:58 p.m.-6:20 a.m.

1 stop8h 22m

C$ 510

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 13/5

8:10 a.m.-8:55 p.m.

1 stop15h 45m

San Francisco

Wed 20/5

5:25 a.m.-4:05 p.m.

1 stop7h 40m

C$ 522

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Wed 14/10

8:55 p.m.-12:50 a.m.

Nonstop6h 55m

San Francisco

Sun 18/10

10:00 p.m.-6:45 a.m.

Nonstop5h 45m

C$ 523

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Mon 27/7

8:20 p.m.-11:57 p.m.

Nonstop6h 37m

San Francisco

Fri 31/7

11:05 p.m.-8:01 a.m.

Nonstop5h 56m

C$ 584

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Sun 9/8

5:40 a.m.-10:27 a.m.

1 stop7h 47m

San Francisco

Sat 15/8

10:00 p.m.-6:51 a.m.

Nonstop5h 51m

C$ 590

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Fri 19/6

8:05 p.m.-1:42 a.m.

1 stop8h 37m

San Francisco

Tue 23/6

6:56 p.m.-5:58 a.m.

1 stop8h 02m

C$ 597

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Tue 30/6

5:35 a.m.-1:40 p.m.

2 stops11h 05m

San Francisco

Tue 7/7

8:55 a.m.-11:20 p.m.

2 stops11h 25m

C$ 618

BostonSan Francisco

BOS - SFO

BOSSFO

Boston Logan Intl

Thu 21/5

8:59 p.m.-12:32 a.m.

Nonstop6h 33m

San Francisco

Sun 24/5

7:05 a.m.-4:01 p.m.

Nonstop5h 56m

C$ 618

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/4

Showing 1-10 of 23 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 round-trip 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?

To ensure you get the cheapest price possible for a flight from Boston to San Francisco, you should look to book at least 89 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 C$ 463). Flying from Boston to San Francisco in April is currently the most expensive (average of C$ 649). 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?

When flying from Boston to San Francisco, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 74% versus a flight at noon.

How much does it cost to fly round-trip from Boston to San Francisco?

Reviews of airlines servicing San Francisco

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

JetBlue

7.2

Good

2,963 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Mar 2026

FLL - ORH

I pay extra for an even more seat row 3, but the luggage area has no more spots so i have to place my luggage in row 10. This was totally un accepatable.

JetBlue

7.2

Good

2,963 reviews

JetBlue

7.2

Good

2,963 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Mar 2026

FLL - ORH

I pay extra for an even more seat row 3, but the luggage area has no more spots so i have to place my luggage in row 10. This was totally un accepatable.

Related info for your journey

What airports do I use to fly from Boston to San Francisco?
If you wish to fly to San Francisco from Boston, then you need to book flights from Boston Logan Intl to San Francisco. There are 27 flights from Logan Intl (BOS) to San Francisco (SFO) per day to choose from. Flights to San Francisco from Logan Intl are available from 1 airline, which means you should have some options if you want to compare airfare deals. 6h 33m is how long a nonstop flight from Boston to San Francisco typically takes.
How popular is this Boston to San Francisco flight route?
Flights from Boston Logan Intl to San Francisco have been viewed 5 times in the past calendar month.
How long is the flight from Boston to San Francisco?
For as low as C$ 447, United Airlines can have you in San Francisco from Boston in 6h 27m. Airlines will cover a distance of 4339 km. This flight may include one or multiple stops.
What is the cheapest airline to fly from Boston to San Francisco round-trip?
Cheapflights users have booked flights from Boston to San Francisco round-trip from C$ 162. JetBlue is 69% cheaper than the average price of flights available within the next 90 days to this destination.
What are the most reliable airlines from Boston to San Francisco?
No one likes to see their flight delayed. When booking a flight from Boston to San Francisco consider choosing WestJet (88%), Japan Airlines (79%) or United Airlines (78%) as they are the most reliable in getting you off to your destination on time.
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 vacation 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 C$ 463). Flying from Boston to San Francisco in April is currently the most expensive (average of C$ 649). 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 airline flying from Boston to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	CheapestC$ 162	AverageC$ 390	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights

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

When you search for this flight from Boston to San Francisco, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Boston to San Francisco, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Boston to San Francisco become cheaper?

Not ready to book yet? You can track prices for flights from Boston to San Francisco on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheap flights from Boston to San Francisco from C$ 202

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 30/5. 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 27 April 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 27 April 2026.

Best flights from Boston to San FranciscoDiscover carefully curated flight deals from Boston to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 27 April 2026.

Discover carefully curated flight deals from Boston to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 27 April 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 27 April 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 27 April 2026.

Last-minute flights from Boston to San FranciscoDiscover last-minute flight deals from Boston to San Francisco. Data last updated 27 April 2026 and is based on user searches.

Discover last-minute flight deals from Boston to San Francisco. Data last updated 27 April 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 27 April 2026.

Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated 27 April 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 to fly round-trip 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 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 is the cheapest airline to fly from Boston to San Francisco round-trip?

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?

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Boston and San Francisco flights

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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 27 April 2026.

Best flights from Boston to San Francisco
Discover carefully curated flight deals from Boston to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 27 April 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 27 April 2026.

Last-minute flights from Boston to San Francisco
Discover last-minute flight deals from Boston to San Francisco. Data last updated 27 April 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 27 April 2026.