Cheap flights from Boston to San Francisco from $215

If you aren’t able to travel during the month of January, then book flights to San Francisco from Boston during September instead. Flights to San Francisco in September, while not as cheap as those in January, still average around $484.

According to our data, Saturday is the cheapest day to fly to San Francisco from Boston. The lowest ticket price found for a Saturday departure recently was $1,003. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Boston to San Francisco for around $2,645.

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

You are more likely to see cheaper flights to San Francisco from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $543 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Boston for as low as $389 on momondo.

As of May 2026, prices for Boston to San Francisco flights are approximately 1% more expensive when compared to flights at the same time last year.

Historically, on average around 16% of flights between Boston and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 177 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday 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 13% of their flights experiencing any sort of delay.

25 flights are operational daily from Boston to San Francisco as of May 2026. The most popular departure time for this route is 20:00, with 50% of flights per day taking off at midday.

The number of flights available between Boston and San Francisco is 175 per week as of May 2026. The most frequent departure day is Tue, with 19% of weekly flights leaving on this day.