Alaska Airlines Flights from Washington, D.C. to Seattle

Alaska Airlines on this route

Seattle is a Alaska Airlines hub, so Alaska Airlines typically offers several daily departures on WAS–SEA, with nonstop service where demand supports it and connections through its other hubs otherwise. The nonstop flight time is about 5h.

Fare classes available: Saver, Main, Premium Class, First Class. No change fees on Main and First fares; fare difference applies.

Recorded lows on WAS–SEA start at $199 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.

2,300 miles is a serious flight, roughly 5h nonstop, and it is the range where premium economy or a domestic first-class seat can be worth asking about, particularly on midweek departures when upgrade fares drop.

In our recent fare history for this pair, the lowest prices were recorded on Alaska and United. That mix changes week to week, which is why an agent checks every carrier rather than assuming the cheapest one from last month.

When to fly

Winter fares out of the Northeast peak around the holidays and February school breaks; late April to early June and September to early November are usually the calmest on price.

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.