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Cheap flights from Seattle to Washington, D.C. from £93

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 20/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
21 Jan — 28 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in August or July, booked 83 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 22 December 2025.

Fri 26/1208:00SEA - IAD
Nonstop5h 06mUnited Airlines
Sat 24/117:55IAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 19/12£342
Fri 26/1208:00SEA - DCA
Nonstop5h 05mAlaska Airlines
Fri 9/118:56DCA - SEA
1 stop17h 22mAlaska Airlines
Deal found 20/12£380
Sun 21/1219:55SEA - IAD
1 stop18h 26mAlaska Airlines
Mon 26/118:04IAD - SEA
Nonstop6h 04mAlaska Airlines
Deal found 20/12£429
Sun 21/1209:00SEA - DCA
1 stop8h 39mAlaska Airlines
Mon 26/118:56DCA - SEA
1 stop19h 25mAlaska Airlines
Deal found 20/12£436
Sun 21/1215:30SEA - IAD
Nonstop4h 57mDelta
Mon 26/107:30IAD - SEA
Nonstop5h 59mDelta
Deal found 20/12£436
Fri 26/1207:35SEA - DCA
Nonstop5h 01mDelta
Fri 9/116:44DCA - SEA
Nonstop5h 59mDelta
Deal found 20/12£443
Sun 21/1219:12SEA - DCA
2 stops13h 17mUnited Airlines
Mon 26/116:28DCA - SEA
1 stop9h 31mUnited Airlines
Deal found 20/12£481
Wed 31/1215:50SEA - IAD
2 stops16h 55mUnited Airlines
Sun 4/108:26IAD - SEA
Nonstop6h 01mUnited Airlines
Deal found 21/12£484
Mon 29/1215:30SEA - IAD
Nonstop4h 57mDelta
Thu 8/107:30IAD - SEA
Nonstop5h 59mDelta
Deal found 20/12£487
Wed 31/1217:54SEA - DCA
2 stops17h 23mUnited Airlines
Tue 6/112:00DCA - SEA
1 stop9h 14mUnited Airlines
Deal found 20/12£488
Wed 31/1215:50SEA - IAD
2 stops16h 55mUnited Airlines
Mon 5/117:40IAD - SEA
1 stop9h 54mUnited Airlines
Deal found 21/12£488
Wed 31/1213:43SEA - DCA
2 stops19h 15mUnited Airlines
Mon 5/110:30DCA - SEA
2 stops15h 42mUnited Airlines
Deal found 20/12£492

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 22 December 2025.

Round-trip from

£155

One-way from

£93

Popular in

December

Cheapest in

August

Average price

£359

Good one-way deal

£332 or less
United Airlines
  • United Airlines
  • 10/1-17/1
  • 1 total stop
  • 13h 37m total
  • Seattle to Washington, D.C.
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 22/2
  • Nonstop
  • 4h 55m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£31 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
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 22 December 2025.
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 - DCA

SEADCA

Seattle/Tacoma Intl

Wed 4/2

13:55-21:59

Nonstop5h 04m

Washington, D.C. Reagan-National

Wed 25/2

08:59-18:55

1 stop12h 56m

£156

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 14/1

07:20-15:20

Nonstop5h 00m

Washington, D.C. Reagan-National

Thu 15/1

06:05-10:42

1 stop7h 37m

£156

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 4/2

12:00-23:26

1 stop8h 26m

Washington, D.C. Reagan-National

Fri 6/2

16:44-19:43

Nonstop5h 59m

£156

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 16/1

17:10-05:32

1 stop9h 22m

Washington, D.C. Dulles Intl

Mon 19/1

17:55-20:57

Nonstop6h 02m

£157

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 27/1

08:06-20:00

1 stop8h 54m

Washington, D.C. Reagan-National

Wed 4/2

09:59-16:54

1 stop9h 55m

£163

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 25/2

07:10-19:09

1 stop8h 59m

Washington, D.C. Dulles Intl

Thu 26/2

15:42-23:12

1 stop10h 30m

£164

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 26/2

05:00-14:59

1 stop6h 59m

Washington, D.C. Reagan-National

Sun 1/3

12:00-19:03

1 stop10h 03m

£171

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 5/2

07:00-17:35

1 stop7h 35m

Washington, D.C. Dulles Intl

Sun 8/2

14:10-21:12

1 stop10h 02m

£171

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 11/1

19:30-07:35

1 stop9h 05m

Washington, D.C. Dulles Intl

Sun 25/1

17:17-22:43

1 stop8h 26m

£173

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 31/3

07:25-15:23

Nonstop4h 58m

Washington, D.C. Reagan-National

Tue 7/4

16:40-19:34

Nonstop5h 54m

£174

Flights are sorted by cheapest return flights first.

Deals found on 21/12

Showing 1-10 of 42 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 19 December 2025.

To ensure you get the cheapest price possible for a flight from Seattle to Washington, D.C., you should look to book at least 27 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 £86). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £160). 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 22 December 2025.

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 22 December 2025.

The most flights from SEA to WAS are scheduled on a Friday (36 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (11 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 28 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 United Airlines can get you from Seattle to Washington, D.C. in just under 5h. Your travel time can differ by up to 4h 22m. 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 Copa Airlines (100%), Avianca (97%) or United Airlines (97%) 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 £86). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £160). 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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