BOS - SFO

C$ 165 Find Cheap Flights from Boston to San Francisco

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to San Francisco departing on 21/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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KAYAK searches hundreds of travel sites at once for deals on flights to San Francisco

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to San Francisco, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to San Francisco, as well as popular online travel agencies
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Cheap Flight Deals from Boston to San Francisco (BOS-SFO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to San Francisco that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Boston to San Francisco

KAYAK's recommended round-trip deals from the most popular airlines that fly from Boston to San Francisco.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
JetBlue Logo
8:35 p.m. - 12:17 a.m.BOS-SFO
6h 42mdirect
JetBlue Logo
8:44 p.m. - 5:25 a.m.SFO-BOS
5h 41mdirect
C$ 327JetBlue
Find Deal
Sat, 24 May - Sat, 31 May
JetBlue Logo
9:05 a.m. - 12:44 p.m.BOS-SFO
6h 39mdirect
JetBlue Logo
6:00 a.m. - 2:45 p.m.SFO-BOS
5h 45mdirect
C$ 328JetBlue
Find Deal
Wed, 21 May - Wed, 28 May
Alaska Airlines Logo
7:00 a.m. - 10:49 a.m.BOS-SFO
6h 49mdirect
Alaska Airlines Logo
7:24 a.m. - 7:40 a.m.SFO-BOS
21h 16m1 stop
C$ 342Alaska Airlines
Find Deal
Sat, 24 May - Sat, 31 May
United Airlines Logo
2:00 p.m. - 5:31 p.m.BOS-SFO
6h 31mdirect
United Airlines Logo
9:10 p.m. - 5:54 a.m.SFO-BOS
5h 44mdirect
C$ 343United Airlines
Find Deal
Tue, 17 Jun - Sat, 21 Jun
Alaska Airlines Logo
6:00 a.m. - 12:39 p.m.BOS-SFO
9h 39m1 stop
Alaska Airlines Logo
7:24 a.m. - 7:40 a.m.SFO-BOS
21h 16m1 stop
C$ 355Alaska Airlines
Find Deal
Sat, 24 May - Tue, 27 May
United Airlines Logo
9:30 a.m. - 3:10 p.m.BOS-SFO
8h 40m1 stop
United Airlines Logo
11:20 p.m. - 10:23 a.m.SFO-BOS
8h 03m1 stop
C$ 356United Airlines
Find Deal
Sat, 31 May - Sat, 31 May
Hawaiian Airlines Logo
7:59 p.m. - 11:44 p.m.BOS-SFO
6h 45mdirect
Hawaiian Airlines Logo
8:47 p.m. - 5:40 a.m.SFO-BOS
5h 53mdirect
C$ 359Hawaiian Airlines
Find Deal
Thu, 15 May - Mon, 19 May
Hawaiian Airlines Logo
7:00 a.m. - 10:49 a.m.BOS-SFO
6h 49mdirect
Hawaiian Airlines Logo
8:47 p.m. - 5:40 a.m.SFO-BOS
5h 53mdirect
C$ 364Hawaiian Airlines
Find Deal
Wed, 28 May - Sun, 1 Jun
Delta Logo
8:30 p.m. - 12:16 a.m.BOS-SFO
6h 46mdirect
Delta Logo
9:52 p.m. - 6:40 a.m.SFO-BOS
5h 48mdirect
C$ 425Delta
Find Deal
Thu, 8 May - Mon, 12 May
Delta Logo
7:05 a.m. - 10:54 a.m.BOS-SFO
6h 49mdirect
Delta Logo
9:55 p.m. - 6:48 a.m.SFO-BOS
5h 53mdirect
C$ 474Delta
Find Deal
Sat, 12 Jul - Sun, 20 Jul

Expert advice for your flight from Boston to San Francisco

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are specific to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
United Airlines

United’s Economy Plus offers up to 15 cm more legroom than standard economy seats.


United’s Priority Boarding can be purchased to ensure carry-on space, placing you in Zone 2.

JetBlue

JetBlue offers free gate-to-gate Wi-Fi and seatback screens with live TV channels.


JetBlue’s Even More Space upgrade provides up to 18 cm extra legroom and priority security access.

Read more about JetBlueby Harriet Baskas
Delta

Delta’s Comfort Plus seats offer up to 8 cm extra legroom in the economy cabin.


Delta offers free Wi-Fi for SkyMiles members on domestic flights, including this route.

Read more about Deltaby Stefanie Waldek
Airports
BOS

Use the FlyLogan app for gate info, flight status, and pre-ordering meals. Reserve parking in advance during busy travel times.

Read more about BOSby Blane Bachelor
SFO

For a quick city transfer, use BART from SFO. It's affordable and connects to popular areas like the Mission and Embarcadero.

Read more about SFOby Blane Bachelor
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and Delta

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Harriet Baskas

Harriet Baskas

Expert on JetBlue

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Blane Bachelor

Blane Bachelor

Expert on BOS and SFO

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more

KAYAK's insights & trends for Boston to San Francisco flights

Get data-powered insights and trends into flights from Boston to San Francisco to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Boston to San Francisco?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston to San Francisco, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Boston to San Francisco is September, where tickets cost C$ 431 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is C$ 595 and C$ 569 respectively.

Can I save money by flying with a layover from Boston to San Francisco?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.
Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at C$ 161 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Boston to San Francisco, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from Boston to San Francisco, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.

Good to know

Low season

January

High season

May

Cheapest flight

C$ 165
Best time to beat the crowds (9% less expensive on average)
Most popular time to fly and prices are also 0% lower on average.
Flight from Boston to San Francisco

When to book flights from Boston to San Francisco

Are your dates flexible? Find out the best times to travel from Boston to San Francisco based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Boston to San Francisco: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Boston to San Francisco 
GeraldFlew with DeltaBOS-SFOMar 2025
Book a flight early in the morning. The plane & crew will have arrived the previous night
PaulaFlew with Alaska AirlinesBOS-SFOJul 2024
Get your boarding pass online and save it to your wallet App on the iPhone. Makes it so easy
Verified travelerFlew with Alaska AirlinesBOS-SFOMar 2024
Long flight duration. Because of weather it took 8 hrs to get there . On my way back it was smooth and short

FAQs for booking flights from Boston to San Francisco

  • If my pet travels with me on my trip from Boston to San Francisco where will I be able to pick it up upon arrival?

    At San Francisco Airport, pets that are traveling in the baggage compartment will be delivered at the baggage claim area. If you instead brought your pet using your airline’s cargo service, you must contact your airline directly. Each airline has its own off-site cargo office location where you can retrieve your pet after your flight.

  • If I am being picked up at San Francisco Airport, where is the best place for my ride to meet me?

    The airport offers a free cell phone lot that is located near the long-term parking lot. Drivers are advised to park there until your flight arrives, since there is no parking of any kind at the terminal building. The maximum waiting time allowed in the cell phone lot is sixty minutes.

  • Is there a post office at San Francisco Airport?

    There is a full United States Postal Branch at the airport just north of the airport, and there are mailboxes located outside each of the terminal buildings. If you are simply in need of stamps, there are stamp machines located on the Departures level of all of the terminal buildings.

  • Where can I get an Uber at San Francisco International Airport?

    Upon arrival at San Francisco International, you should collect all of your bags and then request your ride. Once you have requested your ride you may meet Uber Pool and Express Pool rides on level 5 of the domestic garage and all other rides, such as Uber Black and SUV, can be met at the departures level located on the second floor of the domestic terminal.

  • What is the cheapest flight from Boston to San Francisco?

    In the last 3 days, the lowest price for a flight from Boston to San Francisco was C$ 119 for a one-way ticket and C$ 236 for a round-trip.

  • Which airports will I be using when flying from Boston to San Francisco?

    On your way to San Francisco, you’ll fly out from Boston Logan Intl. You’ll be landing at San Francisco.

  • Which airlines offer Wi-Fi service onboard planes from Boston to San Francisco?

    All the following airlines offer inflight Wi-Fi service on the Boston to San Francisco flight route: JetBlue, Alaska Airlines, Hawaiian Airlines, Delta, American Airlines, and Asiana Airlines.

  • Which aircraft models fly most regularly from Boston to San Francisco?

    The Airbus A321neo is the aircraft model that flies most regularly on the Boston to San Francisco flight route.

  • Which airline alliances offer flights from Boston to San Francisco?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between Boston and San Francisco, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Boston to San Francisco?

    There are direct flights from Boston to San Francisco on a daily basis.

  • Which is the best airline for flights from Boston to San Francisco, Delta or JetBlue?

    The two airlines most popular with KAYAK users for flights from Boston to San Francisco are Delta and JetBlue. With an average price for the route of C$ 353 and an overall rating of 8.0, Delta is the most popular choice. JetBlue is also a great choice for the route, with an average price of C$ 535 and an overall rating of 7.3.

  • How does KAYAK find such low prices on flights from Boston to San Francisco?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to San Francisco.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to San Francisco?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to San Francisco?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Boston with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to San Francisco?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from Boston to San Francisco

  • After long flights from Boston to San Francisco, you are most likely looking to rest and recuperate. That is where the Best Western Plus Grosvenor Airport Hotel can help. This hotel is located just 1.5 miles from the airport and is the perfect hotel for those traveling for both business and pleasure.
  • If you feel like you need of a bit of a pick-me-up after your long flight from Boston to San Francisco, stop by Freshen Up. This unique airport concept is located in the main hall of San Francisco International Airport near the entrance to gates G91-G102. Freshen Up offers shower facilities, toiletries, ironing facilities, and undergarments, all designed to get you feeling like yourself again after your long flight.
  • If you are craving a cold beer before your flight from Boston to San Francisco, then why not stop by the Boston Beer Works? Located in Terminal C near Gate C-14 at Boston Logan International Airport, this restaurant offers soups and salads as well as a variety of wraps and plates and, of course, a wide selection of craft beers.
  • When looking for something completely unique to commemorate your time in Boston, stop by New England Collections located in Terminal A near Gate A-7 at Boston Logan International Airport. This specialty shop carries a whole host of gifts, clothing, and novelties that highlight the unique New England lifestyle.
  • Sports fans with some time on their hands before flights from Boston to San Francisco should make it a point to stop in at Game On located in Terminal A near Gate A15 in Boston Logan International Airport. This unique concept is part restaurant, part sports bar, and part game room.
See more tips

Prefer to fly direct from Boston to San Francisco?

Find which airlines fly direct from Boston Logan Intl Airport to San Francisco Airport, which days they fly and book direct flights.

Direct departures

Boston Logan Intl to San Francisco

Monday

ANA,Air New Zealand,Alaska Airlines, +20 more

ANA,Air New Zealand, +21 more

Tuesday

ANA,Air New Zealand,Alaska Airlines, +19 more

ANA,Air New Zealand, +20 more

Wednesday

ANA,Air China,Air New Zealand, +20 more

ANA,Air China, +21 more

Thursday

ANA,Air New Zealand,Alaska Airlines, +20 more

ANA,Air New Zealand, +21 more

Friday

ANA,Air New Zealand,Alaska Airlines, +20 more

ANA,Air New Zealand, +21 more

Saturday

ANA,Air China,Air New Zealand, +20 more

ANA,Air China, +21 more

Sunday

ANA,Air New Zealand,Alaska Airlines, +21 more

ANA,Air New Zealand, +22 more

See more nonstop flights

Direct returns

San Francisco to Boston Logan Intl

Monday

ANA,Air New Zealand,Alaska Airlines, +22 more

ANA,Air New Zealand, +23 more

Tuesday

ANA,Air New Zealand,Alaska Airlines, +21 more

ANA,Air New Zealand, +22 more

Wednesday

ANA,Air China,Air New Zealand, +21 more

ANA,Air China, +22 more

Thursday

ANA,Air New Zealand,Alaska Airlines, +22 more

ANA,Air New Zealand, +23 more

Friday

ANA,Air New Zealand,Alaska Airlines, +20 more

ANA,Air New Zealand, +21 more

Saturday

ANA,Air China,Air New Zealand, +23 more

ANA,Air China, +24 more

Sunday

ANA,Air New Zealand,Alaska Airlines, +21 more

ANA,Air New Zealand, +22 more

See more nonstop flights
See more nonstop flights

Top airlines flying from Boston to San Francisco

 
See real verified KAYAK customer reviews for airlines flying from Boston to San Francisco. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to San Francisco? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7919 reviews
7.9Comfort
7.3Food
8.2Boarding
8.5Crew
7.9Entertainment
Airline reviews

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

10.0 ExcellentGary, Apr 2025TPA - LAX
Read more Delta reviews

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Seats are much much more comfortable than United, which is what I usually fly

Logan airport construction meant that boarding was chaotic crowded and delayed

If I pay extra for "comfort+" I expect leg room where I can stretch my legs. I was seated with an attendant's seat blocking my feet. Knee space was fine but my feet had less room than the non-"comfort+" seats. Also, don't go cheap on food when you have flights of 3+ hours. It's insulting.

Only one side of the heafphone jack work. Crew was friendly and helpful.

Great. Flight departed early and arrived early. Deplaning and baggage claim ww were quick.

Don't waste your money or points on first class. Delta first class is a joke. The seats were rickety, the food was awful, and nothing worked, wifi, my light, the power plug - and it was dirty - the fold out table was gross. For 2-3 hours, tough it out in Economy.

They separated our seats and moved us to the back of the plane. Hundreds of dollars and thousands of miles used and this was my platinum member experience.

Flight was changed from departing from Boston to departing from Detroit.

AC barely worked on a 50 minute flight. It was very warm the whole flight. Flight was very bumpy and hard landing.

Excellent. Although they used to greet me as a mosaic member and provide a free drink, early boarding helps me to keep coming back to JetBlue.

Cancelled flight with no specific instructions to get a boarding pass for another flight. The whole flight of people were in line for an hour because there was only 1 person to help at the desk. This was unusual for JetBlue.

It was too hot in the cabin. The AC did not help.

Except for the 28 minute delay leaving and the earlier reschedule to a later takeoff time the flight was good.

Loved the leg room and tvs screens on the seats and free WiFi. Wish the price was lower and could save by rebooking

It took 1-1/2 hours to get our luggage after we landed. That to me is unacceptable

The flight was delayed for 4 hours. Once onboard the crew was wonderful.

Overall was excellent. Will definitely us JetBlue in the future.

I rate it is good we had a 4-hour travel delay at one point but JetBlue gave out food vouchers and travel points credits for another flight so they try to make up for it

Smooth boarding and friendly crew. Unfortunately as soon as we boarded the unit that provides air circulation failed. The pilot informed us and requested maintenance technicians to check it out. The plane became uncomfortably warm without any fresh air coming in. Plus the repair delayed our departure. I am glad the maintenance crew were able to fix the problem. I also was without use of my tv monitor for the first 1/3rd of the trip.

Everything you need to know for your flight from Boston to San Francisco

Information on your arrival and departure airports

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