Save time at SFO by using the AirTrain Red Line to quickly navigate between terminals after clearing security.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $237 (Delta) |
One-way from | $137 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $364 |
Good round-trip deal | $296 or less |
Good one-way deal | $179 or less |
Fly from
Fly to
Route
Depart
Return
Price
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Fri 12/5
7:00 am-3:37 pm
Nonstop5h 37m
Boston Logan Intl
Mon 12/8
6:52 pm-10:48 pm
Nonstop6h 56m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Tue 3/10
8:41 pm-5:12 am
Nonstop5h 31m
Boston Logan Intl
Thu 3/26
8:45 pm-12:34 am
Nonstop6h 49m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Sat 2/14
7:00 am-8:03 pm
1 stop10h 03m
Boston Logan Intl
Sat 2/21
7:00 am-11:00 am
Nonstop7h 00m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Tue 5/5
9:55 pm-6:49 am
Nonstop5h 54m
Boston Logan Intl
Sat 5/9
7:05 am-11:02 am
Nonstop6h 57m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Wed 4/15
10:30 pm-7:03 am
Nonstop5h 33m
Boston Logan Intl
Wed 4/22
8:40 pm-12:24 am
Nonstop6h 44m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Tue 4/7
11:45 am-12:14 am
1 stop9h 29m
Boston Logan Intl
Mon 4/13
8:40 pm-12:24 am
Nonstop6h 44m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Tue 5/5
6:55 am-3:40 pm
Nonstop5h 45m
Boston Logan Intl
Wed 5/6
1:00 pm-10:55 pm
1 stop12h 55m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Sat 5/2
10:55 pm-7:33 am
Nonstop5h 38m
Boston Logan Intl
Tue 5/5
1:00 pm-9:13 pm
1 stop11h 13m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Mon 3/9
11:30 pm-10:20 am
1 stop7h 50m
Boston Logan Intl
Mon 3/16
8:45 pm-12:34 am
Nonstop6h 49m
San FranciscoBoston
SFO - BOS
SFOBOS
San Francisco
Thu 11/27
12:15 pm-8:48 pm
Nonstop5h 33m
Boston Logan Intl
Thu 12/4
5:40 am-11:45 am
1 stop9h 05m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
The best time to book flights from San Francisco to Boston is 69 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, February is the cheapest month in which you can book a flight from San Francisco to Boston (average of $119). Flying from San Francisco to Boston in June is currently the most expensive (average of $218). 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.
It’s typically best to fly out from San Francisco to Boston in the afternoon. Doing so could potentially save you 17% on the flight price compared to flying in the morning, which is usually more expensive.
Travelers seeking maximum savings on their San Francisco to Boston flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
About 13% of weekly flights between San Francisco and Boston have experienced delays in the past year, with the average delay time being 165 minutes.
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Tuesday 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.
Over the last year, Scandinavian Airlines have had the lowest number of delays on this route, with just 5% of flights being delayed.
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Hannah,Aug 2025
SFO - SAN
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Hannah,Aug 2025
SFO - SAN
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Hannah,Aug 2025
SFO - SAN
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Hannah,Aug 2025
SFO - SAN
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Hannah,Aug 2025
SFO - SAN
Food
Crew
Boarding
Overall
Entertainment
Comfort
Reviews
Hannah,Aug 2025
SFO - SAN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$100 | Average$208 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$144 | Average$361 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$160 | Average$348 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$183 | Average$380 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$186 | Average$402 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$208 | Average$391 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$231 | Average$442 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$238 | Average$403 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$249 | Average$407 | FlexibilityNo cancel fee | On-time71% |