Cheap flights from San Diego to Seattle from $103

In general, February is the cheapest month to fly from San Diego to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $197. If you don’t want to visit Seattle in February, then you should wait until January to fly from San Diego, when ticket prices are also cheap, with an average price of $199.

On average, the least expensive day to fly to Seattle from San Diego is on a Thursday. momondo users have found tickets for Thursday departures for as low as $320. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from San Diego because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $537.

Flying to Seattle from San Diego in the evening is the least expensive time of day to depart. momondo users have found prices as low as $338 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $403. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Seattle from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $251 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from San Diego for as low as $219 on momondo.

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

Alaska Airlines, Delta and Frontier are the top three most popular airlines that fly to Seattle from San Diego according to our data. Alaska Airlines is the first choice among our users, with 54% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 8 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Historically, on average around 11% of flights between San Diego and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 152 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights at night 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. Friday has historically seen more delays on average compared to the rest of the week.

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 9% of their flights experiencing any sort of delay.

Denver (DEN) was the most common stop: 43% of momondo users choosing 1-stop flights on this route connected there.

Flights via Denver (DEN) offer the lowest average round-trip price of $174.

Flights connecting via San Jose (SJC) have the shortest average one-way travel time: 4h 20m.

San Jose (SJC) has the shortest average layover time for this route: 0h 38m.

As of May 2026, 22 flights take off from San Diego and land in Seattle each day. The most common flight departure time for this route is 1:00PM, with 57% of daily flights taking off in the afternoon.

157 flights are operational weekly from San Diego to Seattle as of May 2026. The most popular departure day for this route is Thu, with 21% of flights per week taking off on this day.