Cheap flights from San Francisco to Seattle from $85

In general, February is the cheapest month to fly from San Francisco to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $209. If you don’t want to visit Seattle in February, then you should wait until January to fly from San Francisco, when ticket prices are also cheap, with an average price of $267.

On average, the least expensive day to fly to Seattle from San Francisco is on a Thursday. momondo users have found tickets for Thursday departures for as low as $337. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from San Francisco because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $479.

Flying to Seattle from San Francisco in the evening is the least expensive time of day to depart. momondo users have found prices as low as $314 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $405. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Seattle from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $291 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from San Francisco for as low as $212 on momondo.

There are 4 cabin classes available to choose from on San Francisco to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest and Delta are the most popular carriers operating from San Francisco to Seattle/Tacoma Intl

Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to Seattle from San Francisco according to our data. Alaska Airlines is the first choice among our users, with 62% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Historically, on average around 17% of flights between San Francisco and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 134 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon 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 15% of their flights experiencing any sort of delay.

The number of flights available between San Francisco and Seattle is 49 per day as of August 2026. The most frequent departure time is 2:00PM, with 49% of daily flights leaving in the afternoon.

As of August 2026, 343 flights take off from San Francisco and land in Seattle each week. The most common flight departure day for this route is Tue, with 25% of weekly flights taking off on this day.