Cheap flights from San Francisco to Boston from $239

In general, January is the cheapest month to fly from San Francisco to Boston. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $473. The month of September is another great option to travel to Boston, with average flight prices from San Francisco averaging around $507.

According to our data, the cheapest time of day to fly to Boston is in the evening. momondo users have found flights departing from San Francisco to Boston in the evening for as low as $376. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. At midday is when there is more demand to fly to Boston, so prices are often more expensive at around $536 per ticket.

Fly from San Francisco to Boston Logan Intl for the best San Francisco - Boston Logan Intl flight prices

You are more likely to see cheaper flights to Boston from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Boston for around $589 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from San Francisco for as low as $545 on momondo.

There are 3 cabin classes available to choose from on San Francisco to Boston flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between San Francisco to Boston.

Historically, on average around 17% of flights between San Francisco and Boston have experienced a delay on any given week. The average delay length over the past 12 months has been 174 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, Alaska Airlines have had the fewest delays on this route over the last 12 months, with about 13% of their flights experiencing any sort of delay.

46 flights are operational daily from San Francisco to Boston as of June 2026. The most popular departure time for this route is 12:00, with 43% of flights per day taking off at midday.

326 flights are operational weekly from San Francisco to Boston as of June 2026. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.