Cheap Flights Seattle to Washington D.C. from £82

Flight FAQs

• Which airlines offer the cheapest flights from Seattle to Washington D.C.?

  Based on Trip.com data, Frontier Airlines offers Cheapest nonstop one-way flights from £82 (for example, SEA–DCA on Tue, Sep 15). For a Cheapest nonstop return flight, Frontier Airlines offers fares from £157, departing on Fri, Sep 25 and returning on Mon, Sep 28.

• Which airlines offer direct flights from Seattle to Washington D.C.?

  At the moment, you can catch a direct flight from Seattle to Washington D.C. with the following airlines, including: Alaska Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is a flight from Seattle to Washington D.C.?

  A flight from Seattle (SEA) to Washington D.C. (WAS) takes an average of 5 hours 2 minutes.

• When is the best time to book flights from Seattle to Washington D.C.?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to Washington D.C. is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there from Seattle to Washington D.C. each week?

  On average, 58 direct flights operate each week between Seattle and Washington D.C.. See below the schedules of the main airlines serving this route:
  Alaska Airlines: S/M/T/W/T/F/S – AS004 (departure at 08:08)

• How can I find the best deals on flights from Seattle to Washington D.C.?

  Here are some tips for finding the best flight deals from Seattle to Washington D.C. on Trip.com:
  · Be flexible with your travel dates. The cheapest flight is currently on Tue, Sep 15, with one-way fares from just £82.
  · Compare airlines. Delta Air Lines currently offers the lowest fares on this route.
  · Set up a price alert to track fare changes without searching every day.
  · Check Trip.com regularly for flight deals and available promo codes.
  · Avoid peak season or book early. July is generally the busiest month for travel to Washington D.C..
  · Get exclusive promo codes on the Trip.com app.

• When is the best time to book a flight from Seattle to Washington D.C. to get the best price?

  The cheapest month to book a flight from Seattle to Washington D.C. is usually October, when demand is lower.

• Which upcoming date is the cheapest for flights from Seattle to Washington D.C.?

  After crunching the numbers on our September flight calendar, it's currently cheapest to fly from Seattle to Washington D.C. on September 18, 2026 with Frontier Airlines, with prices starting at £81.

• Which airports should you choose for flights from Seattle to Washington D.C.?

  Flights to Washington D.C. can arrive at: Ronald Reagan Washington National Airport (DCA)Dulles International Airport (IAD). The most common route connects Seattle-Tacoma International Airport and Ronald Reagan Washington National Airport (SEA–DCA).

• What is the time difference between Seattle and Washington D.C.?

  The time difference between Washington D.C. and Seattle is 3h.

• How can I change or cancel my flight ticket from Seattle to Washington D.C.?

  Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

• What is the average price of a one-way flight from Seattle to Washington D.C.?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Seattle to Washington D.C. is £197. Fares vary by travel date, airline and availability.

• What is the average price of a return flight from Seattle to Washington D.C.?

  Based on Trip.com data for flights departing in the next 30 days, the average return fare from Seattle to Washington D.C. is £349. Fares vary by travel date, airline and availability.

• How do I book flights from Seattle to Washington D.C. on Trip.com?

  Enter Seattle and Washington D.C., choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveller details and complete payment to receive your confirmation.

• Are there budget airlines on the Seattle to Washington D.C. route?

  Frontier Airlinesare the most popular budget airlines flying from Seattle to Washington D.C.. Check baggage, seat and payment fees before comparing the final price.