Cheap flights from San Francisco to Boston from $237

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 $469. The month of February is another great option to travel to Boston, with average flight prices from San Francisco averaging around $516.

On average, the least expensive day to fly to Boston from San Francisco is on a Monday. momondo users have found tickets for Monday departures for as low as $372. However, this price may fluctuate depending on the airline, the season, and holidays. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around $672. These prices are subject to change though, so be sure to set up a Price Alert for flights to Boston.

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 $372. 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 $672 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 $605 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 $542 on momondo.

There is only 1 cabin class 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.

Historically, on average around 20% 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 175 minutes.

Generally, flights departing in the evening 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, United Airlines have had the fewest delays on this route over the last 12 months, with about 18% of their flights experiencing any sort of delay.

33 flights are operational daily from San Francisco to Boston as of September 2026. The most popular departure time for this route is 07:00, with 47% of flights per day taking off at midday.

231 flights are operational weekly from San Francisco to Boston as of September 2026. The most popular departure day for this route is Mon, with 19% of flights per week taking off on this day.