$144+ Cheap flights from Boston to San Francisco (BOS - SFO)
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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
May 17 — May 241
Round-trip
1 adult, Economy
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Find cheap flights from Boston to San Francisco with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Boston Logan Intl to San Francisco are usually found in September or January, booked 90 days in advance, depart on a Wednesday or Thursday and return on a Wednesday
Cheap flight deals from Boston to San Francisco
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Best
Last-minute
One-way
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 April 17, 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 April 17, 2026.
This Trip.com deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:00 am
BOS
- SFO
1 stop14h 34m
Frontier
Mon 4/2710:38 pm
SFO
- BOS
1 stop10h 19m
Frontier
Deal found 4/12![Frontier logo]()
$271
This Expedia deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2912:01 pm
BOS
- SFO
1 stop10h 33m
Multiple Airlines
Mon 6/16:58 pm
SFO
- BOS
1 stop8h 22m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$274
This Expedia deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:00 am
BOS
- SFO
1 stop16h 26m
Multiple Airlines
Tue 6/167:55 am
SFO
- BOS
1 stop18h 45m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$275
This Expedia deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:00 am
BOS
- SFO
1 stop14h 34m
Frontier
Sun 5/310:38 pm
SFO
- BOS
1 stop9h 47m
Frontier
Deal found 4/12![Frontier logo]()
$276
This Alaska Airlines deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/98:05 am
BOS
- SFO
1 stop11h 56m
Alaska Airlines
Tue 6/167:55 am
SFO
- BOS
1 stop18h 45m
Alaska Airlines
Deal found 4/13![Alaska Airlines logo]()
$277
This Expedia deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:00 am
BOS
- SFO
1 stop14h 34m
Multiple Airlines
Fri 5/13:10 pm
SFO
- BOS
Nonstop5h 48m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$279
This Frontier deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:00 am
BOS
- SFO
1 stop14h 34m
Frontier
Mon 4/2710:38 pm
SFO
- BOS
1 stop10h 19m
Frontier
Deal found 4/13![Frontier logo]()
$280
This flugladen.de deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:31 am
BOS
- SFO
1 stop13h 03m
Multiple Airlines
Tue 5/123:20 pm
SFO
- BOS
Nonstop5h 48m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$281
This Flysmarter deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/58:19 pm
BOS
- SFO
Nonstop6h 40m
JetBlue
Tue 5/123:20 pm
SFO
- BOS
Nonstop5h 48m
JetBlue
Deal found 4/14![JetBlue logo]()
$283
This Expedia deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/512:01 pm
BOS
- SFO
1 stop10h 33m
Multiple Airlines
Wed 6/106:00 am
SFO
- BOS
Nonstop5h 39m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$284
This Expedia deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:00 am
BOS
- SFO
1 stop14h 34m
Multiple Airlines
Wed 5/67:00 am
SFO
- BOS
Nonstop5h 35m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$285
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 April 17, 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 April 17, 2026.
This United Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/138:20 pm
BOS
- SFO
Nonstop6h 37m
United Airlines
Mon 7/209:25 pm
SFO
- BOS
Nonstop5h 56m
United Airlines
Deal found 4/15![United Airlines logo]()
$317
This JetBlue deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/28:55 pm
BOS
- SFO
Nonstop6h 36m
JetBlue
Sun 7/1211:44 pm
SFO
- BOS
Nonstop5h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$317
This Delta deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:40 am
BOS
- SFO
Nonstop6h 49m
Delta
Sat 5/91:00 pm
SFO
- BOS
Nonstop5h 50m
Delta
Deal found 4/15![Delta logo]()
$322
This Alaska Airlines deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
BOS
- SFO
2 stops14h 03m
Alaska Airlines
Tue 6/26:16 am
SFO
- BOS
1 stop20h 28m
Alaska Airlines
Deal found 4/12![Alaska Airlines logo]()
$330
This Southwest deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:15 am
BOS
- SFO
2 stops13h 40m
Southwest
Wed 6/37:15 pm
SFO
- BOS
2 stops9h 55m
Southwest
Deal found 4/14![Southwest logo]()
$401
This Delta deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/68:45 pm
BOS
- SFO
Nonstop6h 42m
Delta
Thu 5/77:05 am
SFO
- BOS
Nonstop5h 56m
Delta
Deal found 4/13![Delta logo]()
$322
This United Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/54:15 pm
BOS
- SFO
Nonstop6h 34m
United Airlines
Mon 6/159:25 pm
SFO
- BOS
Nonstop5h 56m
United Airlines
Deal found 4/15![United Airlines logo]()
$332
This Alaska Airlines deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/69:00 am
BOS
- SFO
1 stop11h 14m
Alaska Airlines
Wed 5/135:41 pm
SFO
- BOS
1 stop9h 03m
Alaska Airlines
Deal found 4/13![Alaska Airlines logo]()
$377
This JetBlue deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/65:02 pm
BOS
- SFO
1 stop10h 14m
JetBlue
Fri 5/88:44 pm
SFO
- BOS
Nonstop5h 44m
JetBlue
Deal found 4/13![JetBlue logo]()
$395
This Delta deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:55 pm
BOS
- SFO
Nonstop6h 38m
Delta
Sun 8/910:10 pm
SFO
- BOS
Nonstop5h 35m
Delta
Deal found 4/15![Delta logo]()
$377
This United Airlines deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/306:00 am
BOS
- SFO
Nonstop6h 27m
United Airlines
Sun 8/910:38 pm
SFO
- BOS
1 stop8h 01m
United Airlines
Deal found 4/12![United Airlines logo]()
$378
This Delta deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/317:20 am
BOS
- SFO
Nonstop6h 31m
Delta
Wed 8/512:20 pm
SFO
- BOS
Nonstop5h 42m
Delta
Deal found 4/12![Delta logo]()
$407
Last-minute flights from Boston to San FranciscoDiscover last-minute flight deals from Boston to San Francisco. Data last updated April 17, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to San Francisco. Data last updated April 17, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:00 am
BOS
- SFO
1 stop14h 34m
Frontier
Mon 4/2710:38 pm
SFO
- BOS
1 stop10h 19m
Frontier
Deal found 4/13![Frontier logo]()
$280
This Trip.com deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:00 am
BOS
- SFO
1 stop14h 34m
Frontier
Mon 4/2710:38 pm
SFO
- BOS
1 stop10h 19m
Frontier
Deal found 4/12![Frontier logo]()
$271
This Expedia deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:00 am
BOS
- SFO
1 stop14h 34m
Multiple Airlines
Fri 5/13:10 pm
SFO
- BOS
Nonstop5h 48m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$279
This Expedia deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:00 am
BOS
- SFO
1 stop14h 34m
Multiple Airlines
Wed 5/67:00 am
SFO
- BOS
Nonstop5h 35m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$285
This Expedia deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:00 am
BOS
- SFO
1 stop14h 34m
Frontier
Sun 5/310:38 pm
SFO
- BOS
1 stop9h 47m
Frontier
Deal found 4/14![Frontier logo]()
$286
This Expedia deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:00 am
BOS
- SFO
1 stop14h 34m
Frontier
Sun 5/310:38 pm
SFO
- BOS
1 stop9h 47m
Frontier
Deal found 4/12![Frontier logo]()
$276
This flugladen.de deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:31 am
BOS
- SFO
1 stop13h 03m
Multiple Airlines
Tue 5/123:20 pm
SFO
- BOS
Nonstop5h 48m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$281
This Expedia deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:56 pm
BOS
- SFO
1 stop18h 37m
Alaska Airlines
Sat 5/165:41 pm
SFO
- BOS
1 stop9h 03m
Alaska Airlines
Deal found 4/12![Alaska Airlines logo]()
$277
This Expedia deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2912:01 pm
BOS
- SFO
1 stop10h 33m
Multiple Airlines
Mon 6/16:58 pm
SFO
- BOS
1 stop8h 22m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$274
This Expedia deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2912:01 pm
BOS
- SFO
1 stop10h 33m
Multiple Airlines
Mon 6/811:59 pm
SFO
- BOS
Nonstop5h 39m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$284
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 April 17, 2026.
Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated April 17, 2026.
This CheapOair deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:40 pm
BOS
- SFO
1 stop17h 53m
Alaska Airlines
Deal found 4/14![Alaska Airlines logo]()
$144
This KAYAK deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/107:13 am
BOS
- SFO
Nonstop6h 40m
JetBlue
Deal found 4/14![JetBlue logo]()
$145
This Super.com deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/138:21 pm
BOS
- SFO
Nonstop6h 38m
JetBlue
Deal found 4/14![JetBlue logo]()
$146
This KAYAK deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:07 pm
BOS
- SFO
Nonstop6h 42m
JetBlue
Deal found 4/14![JetBlue logo]()
$147
This Cheapflightsfares deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/277:07 pm
BOS
- SFO
Nonstop6h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$148
This Delta deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/138:59 pm
BOS
- SFO
Nonstop6h 33m
Delta
Deal found 4/16![Delta logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2911:25 am
BOS
- SFO
2 stops24h 48m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$150
This Frontier deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/266:00 am
BOS
- SFO
1 stop16h 26m
Frontier
Deal found 4/14![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:00 am
BOS
- SFO
2 stops15h 45m
Frontier
Deal found 4/14![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:12 am
BOS
- SFO
2 stops42h 11m
Frontier
Deal found 4/15![Frontier logo]()
$153
This Cheapflightsfares deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:35 am
BOS
- SFO
Nonstop6h 31m
JetBlue
Deal found 4/14![JetBlue logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3010:25 am
BOS
- SFO
2 stops34h 09m
Multiple Airlines
Deal found 4/17![Multiple Airlines logo]()
$155
Find flight deals from Boston to San Francisco
Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $274 (Expedia) |
One-way from | $144 (CheapOair) |
Popular in | April |
Cheapest in | September |
Average price | $464 |
Good round-trip deal | $366 or less |
Good one-way deal | $191 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Boston to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2026.
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
Cheapest round-trip
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Mon 7/13
8:20 pm-11:57 pm
Nonstop6h 37m
San Francisco
Mon 7/20
9:25 pm-6:21 am
Nonstop5h 56m
$317
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Thu 7/2
8:55 pm-12:31 am
Nonstop6h 36m
San Francisco
Sun 7/12
11:44 pm-8:26 am
Nonstop5h 42m
$317
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Sat 5/2
7:40 am-11:29 am
Nonstop6h 49m
San Francisco
Sat 5/9
1:00 pm-9:50 pm
Nonstop5h 50m
$322
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Wed 5/6
8:45 pm-12:27 am
Nonstop6h 42m
San Francisco
Thu 5/7
7:05 am-4:01 pm
Nonstop5h 56m
$322
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Wed 5/27
6:00 am-5:03 pm
2 stops14h 03m
San Francisco
Tue 6/2
6:16 am-5:44 am
1 stop20h 28m
$330
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Fri 6/5
4:15 pm-7:49 pm
Nonstop6h 34m
San Francisco
Mon 6/15
9:25 pm-6:21 am
Nonstop5h 56m
$332
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Wed 5/6
9:00 am-5:14 pm
1 stop11h 14m
San Francisco
Wed 5/13
5:41 pm-5:44 am
1 stop9h 03m
$377
Quickest round-trip
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Thu 8/6
8:55 pm-12:33 am
Nonstop6h 38m
San Francisco
Sun 8/9
10:10 pm-6:45 am
Nonstop5h 35m
$377
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Thu 7/30
6:00 am-9:27 am
Nonstop6h 27m
San Francisco
Sun 8/9
10:38 pm-9:39 am
1 stop8h 01m
$378
BostonSan Francisco
BOS - SFO
BOSSFO
Boston Logan Intl
Wed 5/6
5:02 pm-12:16 am
1 stop10h 14m
San Francisco
Fri 5/8
8:44 pm-5:28 am
Nonstop5h 44m
$395
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Boston to San Francisco
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to San Francisco in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Boston-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-San Francisco flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Boston-San Francisco flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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?
Use this chart to determine the optimal time to book a round-trip flight from Boston to San Francisco. Price data was last updated on April 10, 2026.
To ensure you get the cheapest price possible for a flight from Boston to San Francisco, you should look to book at least 90 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, September is the cheapest month in which you can book a flight from Boston to San Francisco (average of $338). Flying from Boston to San Francisco in April is currently the most expensive (average of $464). 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?
Find hourly flight availability from Boston to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 17, 2026.
It’s typically best to fly out from Boston to San Francisco in the evening. Doing so could potentially save you 31% on the flight price compared to flying at noon, which is usually more expensive.
What is the cheapest day to fly from Boston to San Francisco?
Use this chart to determine the cheapest time to fly round-trip from Boston to San Francisco. Price data was last updated on April 11, 2026.
Travelers seeking maximum savings on their Boston to San Francisco flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 180 minutes.
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.
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.
Which airline has the best punctuality record on Boston to San Francisco flights?
Over the last year, United Airlines have had the lowest number of delays on this route, with just 13% of flights being delayed.
The best insider tips for Boston to San Francisco flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to San Francisco trip
Our travel experts
Reviews of airlines servicing San Francisco
Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated April 17, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Boston to San Francisco to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Food
7.0
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Food
7.0
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Food
7.0
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Food
7.0
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Food
7.0
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Food
7.0
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
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.
Traveling to a place near San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsSouth San Francisco
Santa Cruz
Santa Clara
Livermore
Rancho Cordova
San Bruno
Watsonville
San Ramon
Union City
Emeryville
Newark
Vacaville
Roseville
San Carlos
Redwood City
Sunnyvale
Turlock
San Lorenzo
Davis
Manteca
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Complete your trip
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Boston and San Francisco flights
Browse other Boston and San Francisco flight options. Last updated on April 17, 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on April 17, 2026.
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Check out other popular destinations found by fellow travelers in 2026
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 April 17, 2026.
Top 9 airlines flying from Boston to San Francisco
Discover the top 9 airlines that operate flights from Boston to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$298 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$119 | Average$228 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$153 | Average$389 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$157 | Average$382 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$174 | Average$368 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$206 | Average$355 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$207 | Average$334 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$231 | Average$426 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$267 | Average$421 | FlexibilityNo cancel fee | On-time71% |