Cheap flights from Boston to San Francisco from C$ 238

The cheapest month to fly to San Francisco from Boston is in January. Flight prices, which tend to average around C$ 480, are often lower during this time because this is during the off-season. The month of September is another great option to travel to San Francisco, with average flight prices from Boston averaging around C$ 500.

The cheapest day to depart from Boston to San Francisco is on a Sunday. Travellers who choose to depart for San Francisco on a Sunday will often find tickets for as low as C$ 419. On the other hand, Friday is the most expensive day to depart from Boston because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 898.

Flying to San Francisco from Boston in the morning is the least expensive time of day to depart. momondo users have found prices as low as C$ 703 when looking at flights departing in the morning. In contrast, the most expensive time of day to depart to San Francisco is in the afternoon when prices are around C$ 1,195.

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 C$ 572 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 C$ 475 on momondo.

There are 2 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 15% on your flight if you consider stops on a Boston to San Francisco flight.

As of June 2026, prices for Boston to San Francisco flights are approximately 5% more expensive when compared to flights at the same time last year.

Historically, on average around 18% 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 172 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. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines has had the least delays on this route over the last 12 months, with about 14% of their flights experiencing any sort of delay.

As of June 2026, 44 flights take off from Boston and land in San Francisco each day. The most common flight departure time for this route is 7:00a.m., with 50% of daily flights taking off at noon.

As of June 2026, 311 flights take off from Boston and land in San Francisco each week. The most common flight departure day for this route is Fri, with 16% of weekly flights taking off on this day.