Cheap flights from Boston to San Francisco from $173

If you aren’t able to travel to San Francisco during the month of January, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $398.

The cheapest day to depart from Boston to San Francisco is on a Wednesday when prices can be found for as low as $433. The most expensive day to fly to San Francisco is Sunday, with ticket prices averaging around $594.

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 $376. Flights in the afternoon are often more expensive with an average ticket price of $523.

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 $420 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 $354 on momondo.

There are 4 cabin classes available to choose from on Boston 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 7% on your flight if you consider stops on a Boston to San Francisco flight.

As of September 2026, prices for Boston to San Francisco flights are approximately 12% more expensive when compared to flights at the same time last year.

JetBlue, Alaska Airlines, and United 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 45% of people opting to fly with this airline when traveling to San Francisco. Keep in mind that there are 8 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 23% 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 169 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the evening 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, United Airlines have had the least number of delays on this route over the last 12 months; with about 20% of their flights experiencing any sort of delay.

Atlanta (ATL) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Atlanta (ATL) offer the lowest average round-trip price of $263.

Flights connecting via Charlotte (CLT) have the shortest average one-way travel time: 10h 11m.

Charlotte (CLT) has the shortest average layover time for this route: 1h 25m.

As of September 2026, there are 34 flights per day flying from Boston to San Francisco. The most common time of day flights depart is 4:00PM, with 46% of flights taking off at noon.

The number of flights available between Boston and San Francisco is 239 per week as of September 2026. The most frequent departure day is Fri, with 19% of weekly flights leaving on this day.