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Cheap flights from Seattle to Washington, D.C. from £88

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 31/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
25 Feb — 4 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in July 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 26 January 2026.

Sat 21/215:40
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 24/207:30
IAD
-
SEA
Nonstop5h 59m
Delta
Deal found 24/1£146
Tue 31/315:55
SEA
-
IAD
Nonstop4h 54m
Delta
Tue 14/407:00
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 24/1£160
Mon 9/306:15
SEA
-
DCA
1 stop7h 40m
Southwest
Thu 12/307:25
DCA
-
SEA
1 stop8h 15m
Southwest
Deal found 23/1£160
Sat 21/223:10
SEA
-
DCA
1 stop6h 43m
Delta
Sat 28/216:44
DCA
-
SEA
Nonstop5h 59m
Delta
Deal found 23/1£168
Tue 28/415:55
SEA
-
IAD
Nonstop5h 14m
Alaska Airlines
Tue 5/507:10
IAD
-
SEA
Nonstop5h 48m
Alaska Airlines
Deal found 24/1£174
Thu 9/410:09
SEA
-
IAD
Nonstop5h 02m
Alaska Airlines
Wed 15/407:00
IAD
-
SEA
Nonstop5h 53m
Alaska Airlines
Deal found 23/1£174
Sat 21/223:10
SEA
-
DCA
1 stop6h 43m
Delta
Tue 24/207:35
DCA
-
SEA
1 stop10h 19m
Delta
Deal found 24/1£175
Mon 23/212:43
SEA
-
IAD
1 stop7h 38m
United Airlines
Mon 2/317:55
IAD
-
SEA
Nonstop6h 01m
United Airlines
Deal found 25/1£178
Sat 21/208:17
SEA
-
IAD
Nonstop5h 02m
United Airlines
Sat 28/214:12
IAD
-
SEA
1 stop10h 00m
United Airlines
Deal found 25/1£181
Mon 2/321:45
SEA
-
IAD
Nonstop4h 55m
Alaska Airlines
Sun 8/307:05
IAD
-
SEA
Nonstop6h 00m
Alaska Airlines
Deal found 23/1£182
Mon 9/317:20
SEA
-
IAD
1 stop9h 16m
United Airlines
Thu 12/317:55
IAD
-
SEA
Nonstop6h 01m
United Airlines
Deal found 23/1£182
Mon 23/223:35
SEA
-
DCA
1 stop7h 54m
United Airlines
Mon 2/317:50
DCA
-
SEA
1 stop10h 09m
United Airlines
Deal found 25/1£188

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 26 January 2026.

Round-trip from

£146

One-way from

£88

Popular in

June

Cheapest in

July

Average price

£284

Good one-way deal

£325 or less
Delta
  • Delta
  • 21/2-24/2
  • Nonstop
  • 10h 53m total
  • Seattle to Washington, D.C.
Search Deals
United Airlines
  • United Airlines
  • 31/3
  • Nonstop
  • 5h 11m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (£3 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 January 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 26 January 2026.
Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Seattle

Fly to

Washington, D.C.

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 31/3

15:55-23:49

Nonstop4h 54m

Washington, D.C. Dulles Intl

Tue 14/4

07:00-09:54

Nonstop5h 54m

£160

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 21/4

21:40-05:40

Nonstop5h 00m

Washington, D.C. Dulles Intl

Fri 1/5

07:10-09:58

Nonstop5h 48m

£174

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 28/4

15:55-00:09

Nonstop5h 14m

Washington, D.C. Dulles Intl

Tue 5/5

07:10-09:58

Nonstop5h 48m

£174

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 21/2

23:10-08:53

1 stop6h 43m

Washington, D.C. Reagan-National

Tue 24/2

07:35-14:54

1 stop10h 19m

£175

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 21/2

06:10-18:54

1 stop9h 44m

Washington, D.C. Dulles Intl

Tue 24/2

17:13-22:05

1 stop7h 52m

£175

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 7/4

14:24-00:15

1 stop6h 51m

Washington, D.C. Dulles Intl

Wed 22/4

17:55-20:53

Nonstop5h 58m

£181

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 24/4

11:58-23:25

1 stop8h 27m

Washington, D.C. Dulles Intl

Mon 27/4

17:55-20:53

Nonstop5h 58m

£181

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 23/4

14:24-00:15

1 stop6h 51m

Washington, D.C. Dulles Intl

Mon 27/4

17:55-20:53

Nonstop5h 58m

£181

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 23/2

23:35-10:29

1 stop7h 54m

Washington, D.C. Reagan-National

Mon 2/3

17:50-00:59

1 stop10h 09m

£188

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 7/4

23:59-10:59

1 stop8h 00m

Washington, D.C. Reagan-National

Wed 22/4

11:55-16:37

1 stop7h 42m

£188

Flights are sorted by cheapest return flights first.

Deals found on 25/1

Showing 1-10 of 44 results
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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 23 January 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 £81). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £153). 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 26 January 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 evening could potentially save you up to 29% 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 26 January 2026.

The most flights from SEA to WAS are scheduled on a Monday (23 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (18 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 21 daily outbound flights to Washington, D.C. from 0 different airlines.

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

    Delta, Alaska Airlines, and United Airlines can get you from Seattle to Washington, D.C. in just under 4h 54m. Your travel time can differ by up to 3h. 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 Austrian Airlines (100%), Brussels Airlines (100%) or Avianca (98%) 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 £81). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £153). 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
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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