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Cheap flights from Seattle to Washington, D.C. from £146

SEA — WAS
24 Oct — 31 Oct1
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.

Tue 3/1120:09 -
2 stops18h 03m
Tue 10/1108:05 -
2 stops29h 54m
Deal found 19/9£258
Sat 7/1108:00 -
Nonstop5h 20m
Sat 14/1117:11 -
Nonstop6h 02m
Deal found 23/9£266
Sat 7/1121:49 -
Nonstop4h 55m
Sat 14/1107:46 -
Nonstop5h 50m
Deal found 23/9£266
Tue 3/1120:09 -
2 stops11h 59m
Tue 10/1110:45 -
2 stops27h 14m
Deal found 19/9£274
Sat 7/1116:27 -
1 stop16h 42m
Sat 14/1107:00 -
1 stop11h 12m
Deal found 23/9£277
Tue 3/1120:09 -
2 stops22h 41m
Tue 10/1118:00 -
1 stop24h 12m
Deal found 19/9£279
Fri 30/1021:36 -
Nonstop5h 04m
Sat 31/1009:38 -
Nonstop5h 42m
Deal found 22/9£280
Sat 7/1109:08 -
Nonstop5h 04m
Sat 14/1107:02 -
Nonstop5h 54m
Deal found 23/9£281
Tue 3/1108:00 -
Nonstop5h 20m
Tue 10/1117:11 -
Nonstop6h 02m
Deal found 19/9£282
Tue 3/1121:49 -
Nonstop4h 55m
Tue 10/1107:46 -
Nonstop5h 50m
Deal found 19/9£282
Sat 24/1013:49 -
Nonstop5h 10m
Sat 31/1017:00 -
Nonstop5h 55m
Deal found 22/9£284
Fri 23/1015:56 -
Nonstop5h 03m
Mon 2/1107:46 -
Nonstop5h 50m
Deal found 22/9£284

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

Round-trip from

£258

One-way from

£146

Popular in

June

Cheapest in

January

Average price

£282
Frontier
  • Frontier
  • 3/11-10/11
  • 4 total stops
  • 47h 57m total
  • Seattle to Washington, D.C.
Search Deals
United Airlines
  • United Airlines
  • 2/11-31/12
  • 1 total stop
  • 7h 52m 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).
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Cheapest flight prices on average. 2% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 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.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Sat 14/11

22:40-10:55

1 stop9h 15m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£150

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Sat 6/2

07:40-20:45

1 stop10h 05m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£150

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Tue 1/12

21:40-05:37

Nonstop4h 57m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£150

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Tue 15/12

18:30-05:35

1 stop8h 05m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£150

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Sat 17/10

11:45-21:35

1 stop6h 50m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£150

SeattleWashington, D.C.

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

SEADCA

Seattle/Tacoma Intl

Mon 26/10

00:10-11:55

1 stop8h 45m

Washington, D.C. Reagan-National

Wed 31/12

00:00-21:00

Nonstop0h 00m

£150

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Wed 21/10

19:25-10:30

2 stops12h 05m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£154

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Thu 15/10

20:29-11:56

2 stops12h 27m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£154

SeattleWashington, D.C.

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

SEAIAD

Seattle/Tacoma Intl

Tue 1/12

20:09-17:39

1 stop18h 30m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-21:00

Nonstop0h 00m

£154

SeattleBaltimore

SEA Seattle/Tacoma Intl - BWI Baltimore/Washington

SEABWI

Seattle/Tacoma Intl

Wed 14/10

19:25-10:30

2 stops12h 05m

Baltimore/Washington

Wed 31/12

00:00-21:00

Nonstop0h 00m

£154

Flights are sorted by cheapest return flights first.

Deals found on 19/9

Showing 1-10 of 60 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 £258). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of £395). 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 57% on airfare.

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

The most flights from SEA to WAS are scheduled on a Tuesday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

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

Airfare is typical for this route at the moment.
Seattle to Washington, D.C. flights typically cost between £256 and £397 in November.
The cheapest return price found within the last 5 days was £258 on Frontier (3 Nov–10 Nov).

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 15 daily outbound flights to Washington, D.C. from 0 different airlines.

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

    Alaska Airlines, Delta, and Southwest can get you from Seattle to Washington, D.C. in just under 4h 55m. Your travel time can differ by up to 5h 05m. Airlines will cover a distance of 2299 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Consider Virgin Atlantic (100%), Qatar Airways (94%) or Avianca (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 £258). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of £395). 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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