Southwest Airlines Flights from San Diego to Seattle

Southwest Airlines on this route

Southwest Airlines serves SAN–SEA through its hub network, usually with one connection. The nonstop flight time is about 2h 46m.

Fare classes available: Basic, Choice / Choice Preferred, Choice Extra. Southwest does not charge change fees on any fare; you pay the fare difference if the new flight is more expensive.

Recorded lows on SAN–SEA start at $100 one-way. That figure comes from cached search data and moves with demand, so treat it as a benchmark for what a good price looks like rather than a guaranteed fare.

Delta Air Lines and United Airlines both operate hubs at one end of this route, so nonstop or single-connection service is usually available, along with American Airlines, Southwest Airlines, and Alaska Airlines. Our agents can book any of them and compare fare classes side by side.

Expect roughly 2h 46m nonstop for the 1,052 miles. On routes this length, basic economy and standard economy often differ by less than a checked-bag fee, so it pays to price the higher fare with the bag included.

When to fly

West Coast and Mountain departures spike over summer holidays and the December break; January (after New Year), late April, May, and September are usually the cheapest windows.

On this specific route our fare history shows November as the cheapest month and September as the most expensive, a spread of $216 between the two.

Midweek travel almost always beats weekends on price here. If your dates are flexible by a day or two, tell the agent; shifting a Friday departure to Thursday or a Sunday return to Monday is the single most reliable way to cut the fare.

For domestic travel, booking three to eight weeks ahead usually captures the best price. Inside two weeks, fares climb; more than four months out, airlines have not yet released their cheapest inventory.