4 hr 49 min is the shortest flight time from Seattle to Washington, D.C..

The cheapest days to fly are usually in January. Typical prices range from $145 to $280.

The best round-trip deal recently found on Google Flights from Seattle to Washington, D.C. was with Frontier from $181. The best one-way deal was with Frontier from $90.

There are direct flights from Seattle to Washington, D.C. on a daily basis.

Alaska, Southwest, United and Delta fly direct from Seattle to Washington, D.C..

The cheapest round-trip flight from Seattle to Washington, D.C. starts at $181 from Thu, Aug 29 to Wed, Sep 4. The cheapest one-way flight starts at $90 and departs on Wed, Sep 4.

Mid-Mar–Jun is Washington DC's busiest time, with many people timing their visits to coincide with cherry blossom season (late Mar–mid Apr). Washington DC’s conference centers and hotels also bustle while Congress is in session (Sep–Nov and mid-Jan–Jun). Jul–Aug tend to be hot and humid, while snowfall can vary widely in winter. The city’s most popular events are the annual Cherry Blossom Festival in spring, the 4th of July celebration in summer, and the lighting of the National Christmas Tree in winter.

It's easy to use Google Flights to find the cheapest days to fly from Seattle to Washington, D.C..
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.