Cheap flights from San Francisco to Boston from $123

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 $337. If you aren’t able to travel during the month of January, then book flights to Boston from San Francisco during September instead. Flights to Boston in September, while not as cheap as those in January, still average around $347.

The cheapest day to depart from San Francisco to Boston is on a Wednesday when prices can be found for as low as $377. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Sunday is $481.

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 $386. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the morning is when there is more demand to fly to Boston, so prices are often more expensive at around $438 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 $388 when searching weeks out. 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 $347 on momondo.

There are 4 cabin classes available to choose from on San Francisco to Boston Logan Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 4% on your flight if you consider stops on a San Francisco to Boston flight.

As of February 2026, prices for San Francisco to Boston flights are approximately 22% more expensive when compared to flights at the same time last year.

JetBlue, Delta, and Frontier are the most popular carriers operating from San Francisco to Boston Logan Intl

JetBlue, United Airlines and Delta are the top three most popular airlines that fly to Boston from San Francisco according to our data. JetBlue is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Boston. Keep in mind that there are 9 different airlines that fly to Boston on a routine basis, so you have a few additional options to choose from.

Historically, on average around 15% 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 in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 11% of their flights experiencing any sort of delay.

Minneapolis (MSP) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Flights via Minneapolis (MSP) offer the lowest average round-trip price of $386.

Flights connecting via Minneapolis (MSP) have the shortest average one-way travel time: 7h 52m.

Minneapolis (MSP) has the shortest average layover time for this route: 1h 10m.

As of February 2026, there are 30 flights per day flying from San Francisco to Boston. The most common time of day flights depart is 8:00AM, with 39% of flights taking off at noon.

213 flights are operational weekly from San Francisco to Boston as of February 2026. The most popular departure day for this route is Fri, with 18% of flights per week taking off on this day.