Cheap flights from Seattle to San Diego from C$ 125

In general, January is the cheapest month to fly from Seattle to San Diego. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 261. If you are unable to visit San Diego during the month of January, then departing from Seattle during the month September is also very affordable. Most momondo users find prices during this month for around C$ 285.

The cheapest day to depart on your flight to San Diego is on a Tuesday when prices can be found for as low as C$ 228. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to San Diego on Friday is C$ 618.

Flying to San Diego from Seattle in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as C$ 302 when looking at flights departing in the afternoon. Flights to San Diego are more costly at noon, with an average ticket price of C$ 416. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to San Diego from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around C$ 367 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from Seattle for as low as C$ 308 on momondo.

You could potentially save up to 74% on your flight if you consider stops on a Seattle to San Diego flight.

As of May 2026, prices for Seattle to San Diego flights are approximately 2% more expensive when compared to flights at the same time last year.

United Airlines, Southwest, and Alaska Airlines are the most popular carriers operating from Seattle/Tacoma Intl to San Diego

Alaska Airlines, Delta and Hawaiian Airlines are the top three most popular airlines that fly to San Diego from Seattle according to our data. Alaska Airlines is the first choice among our users, with 45% of people opting to fly with this airline when travelling to San Diego. Keep in mind that there are 5 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

Historically, on average around 16% of flights between Seattle and San Diego have experienced a delay on any given week. The average delay length over the past 12 months has been 122 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing at night 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, Delta has had the least delays on this route over the last 12 months, with about 13% of their flights experiencing any sort of delay.

22 flights are operational daily from Seattle to San Diego as of May 2026. The most popular departure time for this route is 7:00p.m., with 40% of flights per day taking off in the afternoon.

As of May 2026, there are 154 flights per week flying from Seattle to San Diego. The most common day of the week flights depart is Fri, with 19% of flights taking off on this day.