Cheap flights from Seattle to San Diego from $78

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 $227.

The cheapest day to depart from Seattle to San Diego is on a Wednesday. Travelers who choose to depart for San Diego on a Wednesday will often find tickets for as low as $265. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $303. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

The cheapest time of day to fly to San Diego is in the morning when flights can be purchased for as low as $287. Flights in the evening are often more expensive with an average ticket price of $300.

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 $277 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 $220 on momondo.

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

No. A direct flight is the cheapest option for a flight between Seattle to San Diego.

As of September 2026, prices for Seattle to San Diego flights are approximately 0% more expensive when compared to flights at the same time last year.

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

Alaska Airlines, Delta and Frontier 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 56% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 7 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 17% 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 121 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon 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 14% of their flights experiencing any sort of delay.

Los Angeles (LAX) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

Flights via San Francisco (SFO) offer the lowest average round-trip price of $188.

Flights connecting via Los Angeles (LAX) have the shortest average one-way travel time: 5h 06m.

Los Angeles (LAX) has the shortest average layover time for this route: 1h 03m.

As of September 2026, 21 flights take off from Seattle and land in San Diego each day. The most common flight departure time for this route is 6:00PM, with 38% of daily flights taking off in the evening.

The number of flights available between Seattle and San Diego is 151 per week as of September 2026. The most frequent departure day is Fri, with 28% of weekly flights leaving on this day.