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Cheap flights from Seattle to Washington, D.C. from £119

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 31/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
24 Jul — 31 Jul1
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.
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 24 June 2026.

Sat 19/923:00
SEA
-
IAD
1 stop7h 28m
United Airlines
Sun 27/917:45
IAD
-
SEA
Nonstop5h 52m
United Airlines
Deal found 21/6£217
Tue 1/908:10
SEA
-
IAD
Nonstop5h 06m
United Airlines
Fri 18/913:10
IAD
-
SEA
1 stop9h 05m
United Airlines
Deal found 19/6£218
Wed 19/818:15
SEA
-
IAD
1 stop8h 10m
United Airlines
Wed 26/818:00
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 19/6£220
Thu 27/807:00
SEA
-
IAD
1 stop7h 37m
United Airlines
Mon 31/818:00
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 19/6£222
Thu 17/915:56
SEA
-
IAD
Nonstop5h 03m
Alaska Airlines
Mon 21/907:00
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Deal found 22/6£223
Fri 21/818:10
SEA
-
IAD
1 stop8h 15m
United Airlines
Sun 23/818:00
IAD
-
SEA
Nonstop5h 54m
United Airlines
Deal found 23/6£224
Tue 25/823:00
SEA
-
IAD
1 stop7h 28m
United Airlines
Sun 30/806:30
IAD
-
SEA
1 stop8h 14m
United Airlines
Deal found 19/6£225
Thu 27/808:10
SEA
-
IAD
Nonstop5h 06m
United Airlines
Sat 29/812:50
IAD
-
SEA
1 stop7h 52m
United Airlines
Deal found 20/6£225
Tue 1/923:00
SEA
-
DCA
1 stop6h 55m
United Airlines
Fri 18/915:30
DCA
-
SEA
1 stop10h 15m
United Airlines
Deal found 19/6£227
Thu 6/807:20
SEA
-
DCA
Nonstop5h 01m
Delta
Wed 12/816:35
DCA
-
SEA
Nonstop6h 06m
Delta
Deal found 19/6£228
Wed 12/823:04
SEA
-
IAD
Nonstop5h 03m
United Airlines
Tue 18/813:13
IAD
-
SEA
1 stop8h 54m
United Airlines
Deal found 20/6£228
Thu 10/907:00
SEA
-
DCA
1 stop7h 08m
United Airlines
Sun 13/913:04
DCA
-
SEA
1 stop9h 11m
United Airlines
Deal found 23/6£228

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 24 June 2026.

Round-trip from

£217

One-way from

£119

Popular in

June

Cheapest in

January

Average price

£412
United Airlines
  • United Airlines
  • 19/9-27/9
  • 1 total stop
  • 13h 20m total
  • Seattle to Washington, D.C.
Search Deals
American Airlines
  • American Airlines
  • 31/8
  • 1 total stop
  • 8h 43m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£27 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
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 24 June 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 - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 3/9

23:04-07:07

Nonstop5h 03m

Washington, D.C. Dulles Intl

Tue 8/9

14:43-21:31

1 stop9h 48m

£217

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 26/8

15:58-23:59

Nonstop5h 01m

Washington, D.C. Dulles Intl

Fri 28/8

07:10-09:55

Nonstop5h 45m

£223

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 17/9

21:35-05:40

Nonstop5h 05m

Washington, D.C. Dulles Intl

Mon 21/9

07:00-09:37

Nonstop5h 37m

£223

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 6/8

07:20-15:21

Nonstop5h 01m

Washington, D.C. Reagan-National

Wed 12/8

16:35-19:41

Nonstop6h 06m

£231

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 10/9

20:49-18:14

1 stop18h 25m

Washington, D.C. Dulles Intl

Mon 14/9

07:00-09:37

Nonstop5h 37m

£231

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 12/8

07:20-15:21

Nonstop5h 01m

Washington, D.C. Reagan-National

Wed 19/8

16:35-19:41

Nonstop6h 06m

£231
Fastest return journey

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 31/8

15:58-23:59

Nonstop5h 01m

Washington, D.C. Dulles Intl

Sun 13/9

07:25-10:05

Nonstop5h 40m

£232

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 27/8

20:49-18:14

1 stop18h 25m

Washington, D.C. Dulles Intl

Mon 31/8

07:00-09:37

Nonstop5h 37m

£235

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 19/8

23:04-07:07

Nonstop5h 03m

Washington, D.C. Dulles Intl

Tue 25/8

13:20-16:06

Nonstop5h 46m

£242

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 19/8

20:49-18:14

1 stop18h 25m

Washington, D.C. Dulles Intl

Tue 25/8

07:00-09:37

Nonstop5h 37m

£246

Flights are sorted by cheapest return flights first.

Deals found on 23/6

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
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.

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 £75). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of £1,154). 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 24 June 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 53% 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 24 June 2026.

The most flights from SEA to WAS are scheduled on a Tuesday (26 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (14 on average).

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

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 26 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

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

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

    United Airlines, Delta, and Alaska Airlines can get you from Seattle to Washington, D.C. in just under 5h 01m. 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 Alaska Airlines (92%), Avianca (90%) or Japan Airlines (88%) 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 £75). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of £1,154). 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
Oxon Hill
Gaithersburg
Hanover
Woodbridge
Alexandria

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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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