BOS - SFO

C$ 234 Find Cheap Flights from Boston to San Francisco – Compare and Save

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Everything you should know

Cheapest round-trip
C$ 444
Typical prices: C$ 446-C$ 753
Delta
Wed 24/10Tue 30/10
BOS - SFO • Direct
Cheapest one-way flights
C$ 234
Typical prices: C$ 255-C$ 502
United Airlines
Sat 20/10
BOS - SFO • Direct
Advice from real travellers
JetBlue adds free Wi-Fi; Delta offers it for SkyMiles members on domestic flights.
For more room, JetBlue Even More Space beats Delta Comfort Plus and United Economy Plus.
Expert advice
+1
Expert advice
+1
Direct flights
You can fly direct with United Airlines, JetBlue, and Delta. Average duration is 6h 38m
Direct flights
+1
Direct flights
+1
Avoid delays
Most punctual • 80% on-time
Best time • Fewest delays
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 15 weeks in advance save around 40% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 20% price drop
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Cheapest • Avg C$ 427 (round-trip)
Shortest trip • 7h 32m (one-way)
Insights
Insights
Start a new search
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We hope you enjoy your trip to San Francisco!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Boston to San Francisco (BOS-SFO)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boston to San Francisco

Sat, 24 Oct - Fri, 30 Oct
Delta Logo
10:05 a.m. - 1:43 p.m.BOS  Boston Logan Intl-SFO San Francisco
6h 38mdirect
Delta Logo
12:40 p.m. - 9:20 p.m.SFO  San Francisco-BOS Boston Logan Intl
5h 40mdirect
C$ 444Delta
Wed, 7 Oct - Wed, 18 Nov
Delta Logo
7:45 a.m. - 11:25 a.m.BOS  Boston Logan Intl-SFO San Francisco
6h 40mdirect
Delta Logo
7:00 a.m. - 3:30 p.m.SFO  San Francisco-BOS Boston Logan Intl
5h 30mdirect
C$ 444Delta
Tue, 20 Oct - Tue, 27 Oct
Delta Logo
7:45 a.m. - 11:25 a.m.BOS  Boston Logan Intl-SFO San Francisco
6h 40mdirect
Delta Logo
12:40 p.m. - 9:20 p.m.SFO  San Francisco-BOS Boston Logan Intl
5h 40mdirect
C$ 444Delta
Wed, 21 Oct - Wed, 28 Oct
Delta Logo
7:45 a.m. - 11:25 a.m.BOS  Boston Logan Intl-SFO San Francisco
6h 40mdirect
Delta Logo
3:00 p.m. - 11:39 p.m.SFO  San Francisco-BOS Boston Logan Intl
5h 39mdirect
C$ 444Delta
Tue, 20 Oct - Tue, 10 Nov
JetBlue Logo
9:35 p.m. - 1:05 a.m.BOS  Boston Logan Intl-SFO San Francisco
6h 30mdirect
JetBlue Logo
8:05 a.m. - 7:41 p.m.SFO  San Francisco-BOS Boston Logan Intl
8h 36m1 stop New York John F Kennedy Intl
C$ 445JetBlue
Thu, 3 Dec - Tue, 8 Dec
United Airlines Logo
7:30 a.m. - 11:23 a.m.BOS  Boston Logan Intl-SFO San Francisco
6h 53mdirect
United Airlines Logo
12:45 p.m. - 11:49 p.m.SFO  San Francisco-BOS Boston Logan Intl
8h 04m1 stop Washington, D.C. Dulles Intl
C$ 445United Airlines
Thu, 10 Dec - Mon, 14 Dec
United Airlines Logo
9:45 a.m. - 1:38 p.m.BOS  Boston Logan Intl-SFO San Francisco
6h 53mdirect
United Airlines Logo
12:45 p.m. - 11:49 p.m.SFO  San Francisco-BOS Boston Logan Intl
8h 04m1 stop Washington, D.C. Dulles Intl
C$ 445United Airlines
Sat, 17 Oct - Mon, 26 Oct
JetBlue Logo
7:00 a.m. - 10:29 a.m.BOS  Boston Logan Intl-SFO San Francisco
6h 29mdirect
JetBlue Logo
7:30 a.m. - 4:05 p.m.SFO  San Francisco-BOS Boston Logan Intl
5h 35mdirect
C$ 447JetBlue
Wed, 4 Nov - Sun, 8 Nov
JetBlue Logo
7:10 a.m. - 3:11 p.m.BOS  Boston Logan Intl-SFO San Francisco
11h 01m1 stop New York John F Kennedy Intl
JetBlue Logo
11:58 p.m. - 10:41 a.m.SFO  San Francisco-BOS Boston Logan Intl
7h 43m1 stop New York John F Kennedy Intl
C$ 448JetBlue
Wed, 30 Sep - Tue, 6 Oct
Delta Logo
7:35 a.m. - 11:04 a.m.BOS  Boston Logan Intl-SFO San Francisco
6h 29mdirect
Delta Logo
12:40 p.m. - 9:20 p.m.SFO  San Francisco-BOS Boston Logan Intl
5h 40mdirect
C$ 451Delta
Booking Insights

Price, demand, and travel trends for Boston to San Francisco flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Boston to San Francisco with more confidence.

How much is a round-trip flight from Boston to San Francisco?

Round-trip flights from Boston to San Francisco start at C$ 444. Prices are below average for this route right now, with typical round-trip fares ranging from C$ 446 to C$ 753. The lowest price found in the past 5 days was C$ 444 on Delta.

What's the cheapest day of the week to fly from Boston to San Francisco?

Wednesday is the cheapest day of the week to fly from Boston to San Francisco and is 9% cheaper than the average day. Sunday is the most expensive day with flight prices 24% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • January is the cheapest month to fly from Boston to San Francisco at C$ 455 round-trip.
  • December (C$ 651) and April (C$ 631) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 43% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are prices from Boston to San Francisco the cheapest?

Flights from Boston to San Francisco are cheapest 15 weeks before departure. Booking in this window typically costs about 40% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Expert advice

Expert advice for your flight from Boston to San Francisco

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Delta and United Airlines

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.

Harriet Baskas

Harriet Baskas

Expert on JetBlue

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.

Blane Bachelor

Blane Bachelor

Expert on BOS and SFO

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.

Key details for Boston to San Francisco flights

Low season

September

Cheapest flight

C$ 234
Best time to beat the crowds (7% less expensive on average)
Most popular time to fly and prices are also 5% lower on average.
Flights 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

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 Delta-Mar 2025
Book a flight early in the morning. The plane & crew will have arrived the previous night
PaulaFlew with Alaska Airlines-Jul 2024
Get your boarding pass online and save it to your wallet App on the iPhone. Makes it so easy

Your Boston to San Francisco flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • 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.

  • Which airlines offer extra legroom and free seat selection on Boston to San Francisco flights?

    Among airlines operating Boston to San Francisco flights:

    • JetBlue: offers extra legroom; offers free seat selection
    • United Airlines: offers extra legroom; offers free seat selection
    • Delta: offers extra legroom; offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • Which airlines are available on the route from Boston to San Francisco?

    3 airlines operate flights between Boston and San Francisco. The airlines offering direct flights on this route include:

    • United Airlines
    • JetBlue
    • Delta

  • Which airports can I use when flying from Boston to San Francisco?

    Flights from Boston to San Francisco usually depart from Boston Logan Intl (BOS) and arrive at San Francisco (SFO).

  • Which airlines include bags at no extra cost on Boston to San Francisco flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • JetBlue: a carry-on bag and a checked bag in Economy Class
    • United Airlines: a carry-on bag and a checked bag in Economy Class
    • Delta: a carry-on bag and a checked bag in Economy Class

    Bag allowance can vary by ticket type, cabin class, route, and airline, so travellers should check the fare details before booking.

  • Which cabin classes can I book on flights from Boston to San Francisco?

    Two cabin classes are available on flights from Boston to San Francisco:

    • Economy Class
    • Business Class

  • How much can I save by taking a layover when flying from Boston to San Francisco?

    On this route, layover flights are cheaper than direct options on average. Layover fares average C$ 427 round-trip via Atlanta Hartsfield-Jackson (ATL), compared to C$ 568 for direct.

  • What is the standard checked bag allowance on flights from Boston to San Francisco?

    There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 48–C$ 138 for the first checked bag in economy. Premium fares and elite status bookings typically include a free checked bag.

  • Which aircraft model is used most often on flights from Boston to San Francisco?

    The Airbus A318/A319/A320/A321 family is used most often on this route, operated mainly by JetBlue. Other aircraft seen on the route include Airbus A321neo variants.

  • Which airports do connecting flights from Boston to San Francisco pass through?

    One-stop flights from Boston to San Francisco most commonly connect through:

    • Atlanta Hartsfield-Jackson (ATL) – 32% of one-stop connections
    • Chicago O'Hare Intl (ORD) – 11% of one-stop connections
    • Philadelphia (PHL) – 7% of one-stop connections
    • San Diego (SAN) – 6% of one-stop connections

    Atlanta Hartsfield-Jackson (ATL) handles the largest share of one-stop connections on this route.

  • Can I save money by using flexible dates for flights from Boston to San Francisco?

    Yes. Being flexible with your travel dates can save you up to 27% on the Boston to San Francisco route. Wednesday is the cheapest departure day at C$ 520 round-trip on average, while Sunday is the most expensive at C$ 703, a difference of C$ 183. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • At what point is a flight considered delayed on the route from Boston to San Francisco?

    A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the Boston to San Francisco route, 22% of flights were delayed in the past 3 months, with delays averaging 2 hours 51 minutes.

  • How are flight departures from Boston to San Francisco spread across the day?

    Morning is the busiest departure period on Boston to San Francisco flights, with 51% leaving in that window. Afternoon departures account for 21%, Evening flights for 21%, and Night flights for 7%.

  • Which popular places can I visit in San Francisco?

    Some of the most popular sights in San Francisco are Fisherman's Wharf, Union Square, and Moscone Center. These are among the most viewed places in San Francisco on KAYAK.

  • What are the earliest and latest flights from Boston to San Francisco?

    These are the earliest and latest flight times available from Boston to San Francisco:

    • Earliest: departs at 6:00 am and lands at 12:38 pm
    • Latest: departs at 9:35 pm and lands at 4:13 am.

    The flight takes about 6h 38m.

  • How expensive are last-minute Boston to San Francisco flights?

    Last-minute fares on this route – booked within 2 weeks of departure – run 41% above the route average of C$ 566. Book 15 weeks before departure for the lowest fares.

  • How long does a flight from Boston to San Francisco take?

    A direct flight from Boston to San Francisco takes 6h 38m, covering 6,981 km.

  • Do I need a passport to fly from Boston to San Francisco?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

  • Have flight prices from Boston to San Francisco changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about C$ 444 to C$ 3,386. That means the highest observed fare was about 8x higher than the lowest one.

  • How are flight prices from Boston to San Francisco looking right now?

    One-way fares from Boston to San Francisco are currently lower than usual. Average one-way flight prices are about C$ 255, which is 33% below the typical average for this route.

  • How does United Airlines's on-time performance compare to other airlines on Boston to San Francisco flights?

    United Airlines is slightly above the route average for timely arrivals, while Delta has a lower on-time arrival rate. On-time arrival rates on Boston to San Francisco flights are:

    • United Airlines: 80% on time
    • Delta: 79% on time
    • JetBlue: 76% on time

    On average, flights on this route are punctual 78% of the time.

  • How do delay rates compare for morning and evening flights from Boston to San Francisco?

    Night flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

  • How much time can I save by choosing a different layover airport when travelling from Boston to San Francisco?

    Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time at 7h 32m, compared with 7h 42m via Lambert-St Louis (STL) and 8h 17m via Salt Lake City (SLC).

  • What is the time difference between Boston and San Francisco?

    San Francisco is 3 hours behind Boston (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at San Francisco Airport (SFO)?

    San Francisco Airport (SFO) hosts 5 major car rental companies, with daily rates starting from around C$ 21 for economy cars. Top options include:
    · Thrifty
    · Europcar
    · Dollar
    · Hertz
    · Fox

  • How much should I expect to pay for a Boston to San Francisco flight?

    Round-trip flights from Boston to San Francisco range from C$ 446 to C$ 753, with an average of C$ 566 over the past 12 months. Anything below C$ 446 counts as a good deal.

  • Which airlines offer Wi-Fi on Boston to San Francisco flights?

    Two airlines offer in-flight Wi-Fi on Boston to San Francisco flights:

    • • JetBlue
    • • Delta

    Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

Your guide to booking Boston to San Francisco flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Wednesday departure instead of Sunday. On this route, Wednesday flights average C$ 520 – about C$ 183 less than Sunday (26% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 15 weeks before you fly. On this route, that window historically saves about 40% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Boston to San Francisco trip for January. Fares historically average C$ 455 round-trip in that month – typically C$ 196 less than the most expensive month, which is December (based on the last 12 months).
  • If arriving on time is high on your priority list, United Airlines is the strongest pick on this route. 80% of United Airlines flights from Boston to San Francisco arrived on time in the past 3 months, slightly above the route's average on-time arrival rate of 78%. When flights on this route do arrive late, the average delay is 2 hours51 minutes, so choosing a carrier with strong on-time performance can make a difference on tight schedules.
  • If you have the time, taking a 1-stop flight through Atlanta Hartsfield-Jackson Airport (ATL) can be cheaper than flying direct. The cheapest layover option averages C$ 427 round-trip on this route – about C$ 141 less than direct flights (based on the last 12 months).
  • 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.

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

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Tuesday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Wednesday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Thursday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Friday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Saturday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Sunday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

See more nonstop flights

Direct returns

San Francisco to Boston Logan Intl

Monday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Tuesday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Wednesday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Thursday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Friday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Saturday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

Sunday

Delta,JetBlue,United Airlines

Delta,JetBlue, +1 more

See more nonstop flights

More options for your flight from Boston to San Francisco

Complete your trip to San Francisco with a hotel stay or car rental