$166+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SFO
Oct 1 — Oct 81
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 January or November, booked 41 days in advance, depart on a Wednesday or Thursday and return on a Wednesday
Cheap flight deals from Boston to San Francisco
Cheapest
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 September 1, 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 September 1, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/31. 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.
Fri 10/212:54 pm -
1 stop9h 54m
Tue 10/137:25 pm -
2 stops13h 27m
Deal found 8/31![Frontier logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 8/29. 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 9/3012:54 pm -
2 stops14h 20m
Mon 10/510:05 pm -
1 stop11h 02m
Deal found 8/29![Frontier logo]()
$305
This CheapOair deal was found by Cheapflights users on 8/27. 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 9/2912:52 pm -
1 stop10h 16m
Tue 10/62:41 pm -
Nonstop6h 18m
Deal found 8/27![Multiple Airlines logo]()
$308
This Expedia deal was found by Cheapflights users on 8/27. 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 9/237:12 am -
1 stop10h 15m
Mon 9/2810:05 pm -
1 stop11h 02m
Deal found 8/27![Multiple Airlines logo]()
$309
This Frontier deal was found by Cheapflights users on 8/27. 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 10/2711:12 am -
1 stop9h 58m
Tue 11/310:17 pm -
1 stop10h 27m
Deal found 8/27![Frontier logo]()
$310
This Alaska Airlines deal was found by Cheapflights users on 8/27. 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 10/287:51 am -
1 stop10h 00m
Wed 10/284:43 pm -
1 stop9h 45m
Deal found 8/27![Alaska Airlines logo]()
$311
This Kiwi.com deal was found by Cheapflights users on 8/29. 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 9/3012:54 pm -
1 stop10h 14m
Sat 10/34:43 pm -
1 stop9h 38m
Deal found 8/29![Multiple Airlines logo]()
$312
This Kiwi.com deal was found by Cheapflights users on 8/27. 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.
Sat 10/317:51 am -
1 stop10h 00m
Tue 11/310:17 pm -
1 stop10h 27m
Deal found 8/27![Multiple Airlines logo]()
$313
This CheapOair deal was found by Cheapflights users on 8/27. 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.
Sat 10/36:50 am -
Nonstop6h 23m
Tue 10/610:05 pm -
1 stop11h 04m
Deal found 8/27![Multiple Airlines logo]()
$314
This Alaska Airlines deal was found by Cheapflights users on 8/31. 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.
Sat 10/37:51 am -
1 stop11h 25m
Sat 10/107:03 am -
1 stop19h 18m
Deal found 8/31![Alaska Airlines logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 8/30. 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 9/227:12 am -
1 stop10h 15m
Tue 9/2910:05 pm -
1 stop11h 04m
Deal found 8/30![Multiple Airlines logo]()
$318
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 September 1, 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 September 1, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/1. 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 11/47:13 am -
1 stop11h 48m
Sun 11/88:33 am -
1 stop12h 25m
Deal found 9/1![Alaska Airlines logo]()
$347
This Delta deal was found by Cheapflights users on 8/27. 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 10/27:35 am -
Nonstop6h 29m
Tue 10/63:00 pm -
Nonstop5h 39m
Deal found 8/27![Delta logo]()
$357
This United Airlines deal was found by Cheapflights users on 8/28. 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 10/169:20 am -
Nonstop6h 23m
Sat 10/2411:20 pm -
Nonstop5h 56m
Deal found 8/28![United Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 8/31. 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.
Sun 11/85:10 am -
1 stop10h 15m
Sat 11/144:30 pm -
2 stops12h 35m
Deal found 8/31![Southwest logo]()
$382
This Alaska Airlines deal was found by Cheapflights users on 8/30. 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 9/227:12 am -
1 stop10h 15m
Sat 9/264:51 pm -
1 stop11h 48m
Deal found 8/30![Alaska Airlines logo]()
$367
This United Airlines deal was found by Cheapflights users on 8/29. 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.
Sun 9/276:00 am -
Nonstop6h 30m
Sun 10/42:05 pm -
Nonstop5h 52m
Deal found 8/29![United Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 8/31. 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.
Mon 11/232:25 pm -
2 stops12h 55m
Tue 12/17:00 am -
2 stops11h 50m
Deal found 8/31![Southwest logo]()
$427
This United Airlines deal was found by Cheapflights users on 8/31. 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 9/257:45 am -
Nonstop6h 30m
Sun 9/277:00 am -
Nonstop5h 55m
Deal found 8/31![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 8/29. 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 9/1910:10 am -
Nonstop6h 32m
Sat 9/265:38 pm -
1 stop11h 02m
Deal found 8/29![Delta logo]()
$445
This Alaska Airlines deal was found by Cheapflights users on 8/29. 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.
Fri 10/96:40 pm -
1 stop17h 09m
Mon 10/127:03 am -
1 stop19h 18m
Deal found 8/29![Alaska Airlines logo]()
$417
This Alaska Airlines deal was found by Cheapflights users on 8/28. 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.
Fri 9/187:59 pm -
1 stop16h 38m
Mon 9/213:41 pm -
2 stops11h 28m
Deal found 8/28![Alaska Airlines logo]()
$445
This Alaska Airlines deal was found by Cheapflights users on 8/27. 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.
Thu 10/17:59 pm -
1 stop16h 38m
Sat 10/317:08 am -
2 stops13h 51m
Deal found 8/27![Alaska Airlines logo]()
$455
Last-minute flights from Boston to San FranciscoDiscover last-minute flight deals from Boston to San Francisco. Data last updated September 1, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to San Francisco. Data last updated September 1, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 8/27. 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.
Sun 9/69:36 am -
1 stop12h 50m
Mon 9/2110:05 pm -
1 stop11h 02m
Deal found 8/27![Frontier logo]()
$350
This Frontier deal was found by Cheapflights users on 8/29. 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.
Sun 9/612:45 pm -
1 stop9h 41m
Sat 10/1710:14 pm -
1 stop10h 48m
Deal found 8/29![Frontier logo]()
$379
This CheapOair deal was found by Cheapflights users on 8/27. 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.
Thu 9/1012:54 pm -
1 stop9h 54m
Sat 9/1910:10 pm -
Nonstop5h 50m
Deal found 8/27![Multiple Airlines logo]()
$358
This Kiwi.com deal was found by Cheapflights users on 8/31. 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 9/1012:54 pm -
2 stops22h 20m
Tue 9/2910:05 pm -
1 stop11h 04m
Deal found 8/31![Frontier logo]()
$359
This CheapOair deal was found by Cheapflights users on 8/27. 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.
Thu 9/1012:54 pm -
1 stop9h 54m
Sat 9/2610:10 pm -
Nonstop5h 50m
Deal found 8/27![Multiple Airlines logo]()
$363
This Kiwi.com deal was found by Cheapflights users on 8/31. 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 9/1012:54 pm -
1 stop9h 54m
Sat 10/34:43 pm -
1 stop9h 38m
Deal found 8/31![Multiple Airlines logo]()
$374
This CheapOair deal was found by Cheapflights users on 8/28. 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.
Thu 9/1012:54 pm -
1 stop9h 54m
Wed 9/2311:25 am -
Nonstop5h 55m
Deal found 8/28![Multiple Airlines logo]()
$377
This Kiwi.com deal was found by Cheapflights users on 8/31. 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.
Fri 9/1112:54 pm -
1 stop9h 54m
Sat 10/34:43 pm -
1 stop9h 38m
Deal found 8/31![Multiple Airlines logo]()
$376
This Frontier deal was found by Cheapflights users on 8/27. 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 9/1112:54 pm -
1 stop9h 54m
Tue 9/1510:05 pm -
1 stop11h 04m
Deal found 8/27![Frontier logo]()
$378
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 September 1, 2026.
Search for one-way flight options from Boston to San Francisco. Find affordable one-way fares based on user searches. Data last updated September 1, 2026.
This Super.com deal was found by Cheapflights users on 8/30. 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.
Tue 10/204:11 pm -
1 stop10h 48m
Deal found 8/30![JetBlue logo]()
$166
This Cheapflightsfares deal was found by Cheapflights users on 8/27. 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.
Sat 10/177:00 am -
Nonstop6h 29m
Deal found 8/27![JetBlue logo]()
$167
This United Airlines deal was found by Cheapflights users on 8/27. 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.
Wed 9/306:17 pm -
Nonstop6h 31m
Deal found 8/27![United Airlines logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 8/28. 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 9/1711:17 am -
2 stops26h 05m
Deal found 8/28![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 8/28. 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 10/2812:39 pm -
2 stops25h 38m
Deal found 8/28![Frontier logo]()
$172
This flugladen.de deal was found by Cheapflights users on 8/27. 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.
Wed 11/47:03 am -
1 stop28h 49m
Deal found 8/27![Alaska Airlines logo]()
$173
This Alaska Airlines deal was found by Cheapflights users on 9/1. 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.
Sat 9/267:59 pm -
1 stop16h 38m
Deal found 9/1![Alaska Airlines logo]()
$174
This United Airlines deal was found by Cheapflights users on 8/29. 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.
Tue 10/209:20 am -
Nonstop6h 23m
Deal found 8/29![United Airlines logo]()
$176
This American Airlines deal was found by Cheapflights users on 8/31. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/134:48 pm -
1 stop10h 42m
Deal found 8/31![American Airlines logo]()
$178
This Delta deal was found by Cheapflights users on 9/1. 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 10/177:45 am -
Nonstop6h 40m
Deal found 9/1![Delta logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 9/1. 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.
Fri 10/211:36 am -
2 stops25h 46m
Deal found 9/1![Frontier logo]()
$180
This Alaska Airlines deal was found by Cheapflights users on 8/28. 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.
Mon 9/287:59 pm -
1 stop16h 38m
Deal found 8/28![Alaska Airlines logo]()
$184
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 September 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $304 (Kiwi.com) |
One-way from | $166 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $393 |
Good round-trip deal | $368 or less |
Good one-way deal | $228 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 7,457,451 searches. Data last updated September 1, 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 Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Wed 11/4
7:13 am-4:01 pm
1 stop11h 48m
San Francisco
Sun 11/8
8:33 am-11:58 pm
1 stop12h 25m
$347
Quickest round-trip
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Fri 10/2
7:35 am-11:04 am
Nonstop6h 29m
San Francisco
Tue 10/6
3:00 pm-11:39 pm
Nonstop5h 39m
$357
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Fri 10/16
9:20 am-12:43 pm
Nonstop6h 23m
San Francisco
Sat 10/24
11:20 pm-8:16 am
Nonstop5h 56m
$357
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Tue 9/22
7:12 am-2:27 pm
1 stop10h 15m
San Francisco
Sat 9/26
4:51 pm-7:39 am
1 stop11h 48m
$367
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Sun 9/27
6:00 am-9:30 am
Nonstop6h 30m
San Francisco
Sun 10/4
2:05 pm-10:57 pm
Nonstop5h 52m
$377
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Sun 11/8
5:10 am-12:25 pm
1 stop10h 15m
San Francisco
Sat 11/14
4:30 pm-8:05 am
2 stops12h 35m
$382
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Fri 9/25
7:45 am-11:15 am
Nonstop6h 30m
San Francisco
Sun 9/27
7:00 am-3:55 pm
Nonstop5h 55m
$389
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Fri 10/9
6:40 pm-8:49 am
1 stop17h 09m
San Francisco
Mon 10/12
7:03 am-5:21 am
1 stop19h 18m
$417
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Mon 11/23
2:25 pm-12:20 am
2 stops12h 55m
San Francisco
Tue 12/1
7:00 am-9:50 pm
2 stops11h 50m
$427
BostonSan Francisco
BOS Boston Logan Intl - SFO San Francisco
BOSSFO
Boston Logan Intl
Sat 9/19
10:10 am-1:42 pm
Nonstop6h 32m
San Francisco
Sat 9/26
5:38 pm-7:40 am
1 stop11h 02m
$445
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 September.
| 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 Accuracy- | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- 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?
To ensure you get the cheapest price possible for a flight from Boston to San Francisco, you should look to book at least 40 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 $339). Flying from Boston to San Francisco in June is currently the most expensive (average of $463). 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 September 1, 2026.
It’s typically best to fly out from Boston to San Francisco in the evening. Doing so could potentially save you 27% on the flight price compared to flying in the afternoon, 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 August 29, 2026.
Travelers seeking maximum savings on their Boston to San Francisco flight should consider departing on Tuesday 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 21% of weekly flights between Boston and San Francisco have experienced delays in the past year, with the average delay time being 173 minutes.
What is the most punctual flight time for Boston to San Francisco flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Boston to San Francisco flights?
Over the last year, United Airlines have had the lowest number of delays on this route, with just 19% 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 September 1, 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.
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
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 Clara
Santa Cruz
Walnut Creek
Emeryville
San Bruno
Burlingame
Rancho Cordova
Roseville
Fairfield
Vallejo
Cupertino
Newark
Hayward
San Ramon
Redwood City
Manteca
San Carlos
Turlock
Davis
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Boston and San Francisco flights
Browse other Boston and San Francisco flight options. Last updated on September 1, 2026.
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Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on September 1, 2026.
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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 7,457,451 searches. Data last updated September 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$311 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$131 | Average$251 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$149 | Average$345 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$166 | Average$412 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$196 | Average$393 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$207 | Average$334 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$237 | Average$457 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$262 | Average$463 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$276 | Average$437 | FlexibilityNo cancel fee | On-time71% |