Cheap flights from Boston to San Francisco from $191

If you aren’t able to travel during the month of September, then book flights to San Francisco from Boston during January instead. Flights to San Francisco in January, while not as cheap as those in September, still average around $481.

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 $535 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 $380 on momondo.

There are 2 cabin classes available to choose from on Boston Logan Intl to San Francisco 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 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 176 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 14% of their flights experiencing any sort of delay.

30 flights are operational daily from Boston to San Francisco as of March 2026. The most popular departure time for this route is 07:00, with 42% of flights per day taking off at midday.

The number of flights available between Boston and San Francisco is 210 per week as of March 2026. The most frequent departure day is Fri, with 18% of weekly flights leaving on this day.