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Cheap flights from Seattle to Washington, D.C. from £97

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
16 Apr — 23 Apr1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in January or August, booked 81 days in advance, depart on a Tuesday or Monday and return on a Tuesday

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.
Explore the most affordable flight options available from Seattle to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 March 2026.

Thu 16/405:15
SEA
-
DCA
1 stop11h 40m
Southwest
Tue 21/407:55
DCA
-
SEA
1 stop7h 50m
Southwest
Deal found 15/3£169
Wed 6/509:20
SEA
-
IAD
1 stop11h 20m
Southwest
Fri 8/517:55
IAD
-
SEA
1 stop8h 35m
Southwest
Deal found 13/3£169
Sat 18/407:00
SEA
-
IAD
1 stop7h 28m
United Airlines
Tue 21/417:55
IAD
-
SEA
Nonstop5h 58m
United Airlines
Deal found 12/3£171
Fri 1/519:12
SEA
-
DCA
1 stop14h 48m
Frontier
Fri 8/518:00
DCA
-
SEA
1 stop18h 49m
Frontier
Deal found 17/3£172
Wed 29/406:50
SEA
-
DCA
2 stops11h 00m
Southwest
Wed 6/515:40
DCA
-
SEA
2 stops9h 50m
Southwest
Deal found 15/3£172
Wed 22/407:00
SEA
-
IAD
1 stop7h 28m
United Airlines
Wed 29/417:55
IAD
-
SEA
Nonstop5h 58m
United Airlines
Deal found 13/3£172
Thu 16/405:15
SEA
-
DCA
1 stop11h 40m
Southwest
Wed 22/416:50
DCA
-
SEA
2 stops10h 05m
Southwest
Deal found 16/3£173
Thu 16/408:00
SEA
-
IAD
1 stop13h 20m
Southwest
Wed 29/406:20
IAD
-
SEA
2 stops14h 25m
Southwest
Deal found 14/3£173
Fri 1/507:30
SEA
-
DCA
Nonstop4h 57m
Delta
Tue 5/516:39
DCA
-
SEA
Nonstop5h 51m
Delta
Deal found 16/3£176
Mon 13/415:59
SEA
-
IAD
Nonstop4h 56m
Delta
Wed 22/407:00
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 15/3£176
Wed 15/406:00
SEA
-
DCA
2 stops9h 40m
Southwest
Mon 20/419:45
DCA
-
SEA
2 stops15h 55m
Southwest
Deal found 13/3£177
Mon 4/507:30
SEA
-
DCA
Nonstop4h 57m
Delta
Sat 9/518:25
DCA
-
SEA
1 stop7h 23m
Delta
Deal found 12/3£179

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

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Washington, D.C. (WAS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 17 March 2026.

Round-trip from

£169

One-way from

£97

Popular in

June

Cheapest in

January

Average price

£322

Good one-way deal

£334 or less
Southwest
  • Southwest
  • 6/5-13/5
  • 3 total stops
  • 19h 15m total
  • Seattle to Washington, D.C.
Search Deals
Delta
  • Delta
  • 16/5
  • 1 total stop
  • 8h 57m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£2 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£4 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to Washington, D.C. that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 17 March 2026.
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

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 28/4

06:00-16:15

1 stop7h 15m

Washington, D.C. Reagan-National

Tue 5/5

15:40-23:35

2 stops10h 55m

£169

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 28/4

15:55-00:09

Nonstop5h 14m

Washington, D.C. Dulles Intl

Wed 29/4

07:10-09:58

Nonstop5h 48m

£180

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 28/4

19:40-17:41

1 stop19h 01m

Washington, D.C. Dulles Intl

Tue 5/5

18:47-10:26

1 stop18h 39m

£180

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 30/4

21:04-17:41

1 stop17h 37m

Washington, D.C. Dulles Intl

Sun 3/5

18:47-09:26

1 stop17h 39m

£194
Fastest return journey

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/5

15:59-23:55

Nonstop4h 56m

Washington, D.C. Dulles Intl

Fri 8/5

07:00-09:44

Nonstop5h 44m

£202

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 14/4

15:59-23:55

Nonstop4h 56m

Washington, D.C. Dulles Intl

Tue 21/4

17:07-21:49

1 stop7h 42m

£202

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 15/4

06:00-17:57

1 stop8h 57m

Washington, D.C. Dulles Intl

Sun 26/4

06:00-10:32

1 stop7h 32m

£209

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 28/4

09:20-23:40

2 stops11h 20m

Washington, D.C. Dulles Intl

Tue 5/5

17:30-23:35

1 stop9h 05m

£213

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/5

23:14-08:37

1 stop6h 23m

Washington, D.C. Reagan-National

Thu 7/5

16:40-19:24

Nonstop5h 44m

£217

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/5

06:30-00:20

2 stops14h 50m

Washington, D.C. Dulles Intl

Fri 8/5

17:55-23:30

1 stop8h 35m

£218

Flights are sorted by cheapest return flights first.

Deals found on 15/3

Showing 1-10 of 43 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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a return flight from Seattle to Washington, D.C.. Price data was last updated on 13 March 2026.

To ensure you get the cheapest price possible for a flight from Seattle to Washington, D.C., you should look to book at least 81 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.

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

Currently, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £90). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of £157). 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?

Find hourly flight availability from Seattle to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 17 March 2026.

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 afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 49% on airfare.

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

Explore weekly flight availability from Seattle to Washington, D.C.. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 17 March 2026.

The most flights from SEA to WAS are scheduled on a Tuesday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

Related info for your journey

Find useful and relevant information for your journey from Seattle to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

    Southwest, Alaska Airlines, and Delta can get you from Seattle to Washington, D.C. in just under 5h 10m. Your travel time can differ by up to 2h 05m. Airlines will cover a distance of 2321 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 ITA Airways (100%), Ethiopian Air (96%) or Brussels Airlines (95%) 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, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £90). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of £157). 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
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Arlington
Alexandria
College Park

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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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