Cheap flights from Boston to San Francisco from $142

If you aren’t able to travel to San Francisco during the month of September, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $338.

The cheapest day to depart from Boston to San Francisco is on a Wednesday when prices can be found for as low as $390. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $555.

Our data shows that the cheapest Boston to San Francisco flights are usually those with departure times in the evening. Our users have found flights to San Francisco in the evening for as low as $340. Flights in the afternoon are often more expensive with an average ticket price of $495.

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 $377 when searching weeks out. 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 $267 on momondo.

There are 4 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.

You could potentially save up to 6% on your flight if you consider stops on a Boston to San Francisco flight.

As of April 2026, prices for Boston to San Francisco flights are approximately 3% cheaper when compared to flights at the same time last year.

Delta, United Airlines, and Alaska Airlines are the most popular carriers operating from Boston Logan Intl to San Francisco

JetBlue, United Airlines and Delta are the top three most popular airlines that fly to San Francisco from Boston according to our data. JetBlue is the first choice among our users, with 41% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 9 different airlines that fly to San Francisco on a routine basis, so you have a few additional options to choose from.

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 180 minutes.

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

Tuesday is statistically the day of the week which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.

Orlando (MCO) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

Flights via Charlotte (CLT) offer the lowest average round-trip price of $277.

Flights connecting via San Diego (SAN) have the shortest average one-way travel time: 8h 57m.

San Diego (SAN) has the shortest average layover time for this route: 1h 20m.

As of April 2026, there are 29 flights per day flying from Boston to San Francisco. The most common time of day flights depart is 7:00AM, with 36% of flights taking off at noon.

The number of flights available between Boston and San Francisco is 206 per week as of April 2026. The most frequent departure day is Wed, with 17% of weekly flights leaving on this day.