Cheap flights from Seattle to San Francisco from £55

The month of January is, on average, the cheapest month to fly to San Francisco from Seattle, with most prices found around £140. If you are unable to visit San Francisco during the month of January, then departing from Seattle during the month May is also very affordable. Most momondo users find prices during this month for around £170.

The cheapest day to depart on your flight to San Francisco is on a Thursday when prices can be found for as low as £148. This is often the case because there is less demand to fly during this day of the week. Flights from Seattle to San Francisco on a Wednesday will generally be more expensive and average around £759. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Our most recent data shows that the best time of day to fly to San Francisco is in the afternoon. Flights from Seattle to San Francisco during this time can be as low as £148. Try not to purchase tickets in the evening because they tend to be around £620. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from Seattle/Tacoma Intl to San Francisco for the best Seattle/Tacoma Intl - San Francisco flight prices

You are more likely to see cheaper flights to San Francisco from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around £182 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 Seattle for as low as £126 on momondo.

There are 4 cabin classes available to choose from on Seattle/Tacoma 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 21% of flights between Seattle and San Francisco have experienced a delay on any given week. The average delay length over the past 12 months has been 131 minutes.

Generally, flights departing at night 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 15% of their flights experiencing any sort of delay.

As of March 2026, 40 flights take off from Seattle and land in San Francisco each day. The most common flight departure time for this route is 07:00, with 43% of daily flights taking off at midday.

286 flights are operational weekly from Seattle to San Francisco as of March 2026. The most popular departure day for this route is Fri, with 26% of flights per week taking off on this day.