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Cheap flights from Seattle to Washington, D.C. from £131

SEA — WAS
20 Sep — 27 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Washington, D.C.

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Washington, D.C.

Wed 16/916:27 -
1 stop16h 44m
Tue 22/918:00 -
2 stops27h 10m
Deal found 17/8£218
Thu 1/1020:15 -
2 stops22h 44m
Sun 4/1007:00 -
1 stop11h 08m
Deal found 20/8£245
Wed 16/921:35 -
Nonstop5h 05m
Tue 22/907:00 -
Nonstop5h 37m
Deal found 17/8£259
Wed 16/921:35 -
Nonstop5h 05m
Tue 22/906:00 -
1 stop30h 42m
Deal found 17/8£260
Thu 1/1021:35 -
Nonstop5h 05m
Sun 4/1007:02 -
Nonstop5h 42m
Deal found 20/8£261
Wed 16/908:41 -
1 stop9h 19m
Tue 22/917:00 -
Nonstop5h 51m
Deal found 17/8£266
Thu 1/1021:45 -
1 stop29h 35m
Sun 4/1007:02 -
Nonstop5h 42m
Deal found 20/8£272
Fri 25/921:35 -
Nonstop5h 05m
Sat 26/909:03 -
Nonstop5h 36m
Deal found 17/8£273
Wed 28/1013:49 -
Nonstop5h 10m
Tue 3/1108:00 -
Nonstop5h 55m
Deal found 18/8£277
Tue 22/915:56 -
Nonstop5h 03m
Thu 1/1017:57 -
Nonstop5h 47m
Deal found 17/8£277
Thu 17/914:52 -
Nonstop5h 04m
Wed 23/907:25 -
Nonstop5h 40m
Deal found 18/8£278
Thu 1/1013:46 -
Nonstop5h 13m
Sun 4/1007:00 -
1 stop11h 08m
Deal found 20/8£280

Find flight deals from Seattle to Washington, D.C.

Round-trip from

£218

One-way from

£131

Popular in

June

Cheapest in

January

Average price

£299
Frontier
  • Frontier
  • 16/9-22/9
  • 3 total stops
  • 43h 54m total
  • Seattle to Washington, D.C.
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Frontier
  • Frontier
  • 21/9
  • 2 total stops
  • 22h 44m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£33 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

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Route

Depart

Return

Price

Cheapest return flight

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - DCA Washington, D.C. Reagan-National

SEADCA

Seattle/Tacoma Intl

Wed 14/10

08:00-16:25

Nonstop5h 25m

Washington, D.C. Reagan-National

Tue 20/10

17:00-19:55

Nonstop5h 55m

£277

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Thu 10/12

16:20-00:15

Nonstop4h 55m

Washington, D.C. Dulles Intl

Mon 14/12

07:00-10:05

Nonstop6h 05m

£277

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Fri 25/9

23:14-07:17

Nonstop5h 03m

Washington, D.C. Dulles Intl

Mon 28/9

17:45-20:37

Nonstop5h 52m

£277

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Fri 23/10

21:36-05:40

Nonstop5h 04m

Washington, D.C. Dulles Intl

Mon 26/10

17:33-20:24

Nonstop5h 51m

£277

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Wed 7/10

14:50-22:49

Nonstop4h 59m

Washington, D.C. Dulles Intl

Sun 11/10

07:05-09:56

Nonstop5h 51m

£277
Fastest return journey

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Wed 23/9

15:56-23:59

Nonstop5h 03m

Washington, D.C. Dulles Intl

Mon 28/9

07:00-09:37

Nonstop5h 37m

£277

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Fri 23/10

14:50-22:49

Nonstop4h 59m

Washington, D.C. Dulles Intl

Sun 25/10

07:05-09:56

Nonstop5h 51m

£277

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Thu 24/9

14:52-22:56

Nonstop5h 04m

Washington, D.C. Dulles Intl

Tue 6/10

07:05-09:56

Nonstop5h 51m

£277

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Thu 17/9

13:57-00:44

1 stop7h 47m

Washington, D.C. Dulles Intl

Wed 23/9

17:33-20:27

Nonstop5h 54m

£284

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Thu 24/9

18:05-05:17

1 stop8h 12m

Washington, D.C. Dulles Intl

Sun 27/9

17:45-20:37

Nonstop5h 52m

£284

Flights are sorted by cheapest return flights first.

Deals found on 16/8

Showing 1-10 of 46 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Seattle with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Seattle to Washington, D.C.

What is the cheapest month to book a flight from Seattle to Washington, D.C.?

Currently, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £241). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of £385). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to WAS?

One of the essential ways to save on airfare from Seattle to Washington, D.C. is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 70% on airfare.

Weekly flight availability from Seattle to Washington, D.C.

The most flights from SEA to WAS are scheduled on a Wednesday (25 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (11 on average).

How much does it cost for a return flight from Seattle to Washington, D.C.?

Airfare is below average for this route at the moment.
Seattle to Washington, D.C. flights typically cost between £226 and £378 in September.
The cheapest return price found within the last 5 days was £218 on Frontier (16 Sept–22 Sept).

How far ahead should I book a flight from Seattle to Washington, D.C.?

To ensure you get the cheapest price possible for a flight from Seattle to Washington, D.C., you should look to book at least 36 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

Related info for your journey

  • What airport do you fly from for flights from Seattle to Washington, D.C.?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Washington, D.C. from Seattle. Booking flights from Seattle/Tacoma Intl (SEA) to Washington, D.C. should be relatively easy as there are 17 daily outbound flights to Washington, D.C. from 0 different airlines.

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

    Delta, United Airlines, and Alaska Airlines can get you from Seattle to Washington, D.C. in just under 4h 59m. Your travel time will be generally consistent. Airlines will cover a distance of 2299 mi. Most flights are nonstop.

  • What are the most reliable airlines from Seattle to Washington, D.C.?

    Consider United Airlines (95%), Austrian Airlines (93%) or Brussels Airlines (93%) when booking your flight. These represent the most reliable airlines when flying from Seattle to Washington, D.C..

  • Can I find deals for flights from Seattle to Washington, D.C. that include hotel bookings?

    Yes. In addition to deals on Seattle to Washington, D.C. flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Washington, D.C.?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Washington, D.C..

  • Can I find deals for business class flights from Seattle to Washington, D.C.?

    Yes. Cheapflights offers flight deals from Seattle to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Washington, D.C.?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £241). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of £385). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Silver Spring
Alexandria
Gaithersburg
Oxon Hill
Hanover
Woodbridge
Glen Burnie
Springfield

Browse thousands of different options on Cheapflights for your next trip

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Cheapflights helps you search for flights from Seattle to Washington, D.C. via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Washington, D.C.?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Washington, D.C..

Can Cheapflights find flights from Seattle to Washington, D.C. with no change fees?

Need flexible booking options for your flight to Washington, D.C. from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Washington, D.C. become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Washington, D.C. from Seattle today and book when prices fit your budget.

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