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Cheap flights from Seattle to Washington, D.C. from £105

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 24/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
28 Nov — 5 Dec1
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 60 days in advance, depart on a Tuesday or Monday and return on a Tuesday

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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 29 October 2025.

Sat 13/1215:30SEA - IAD
Nonstop4h 57mDelta
Thu 8/107:30IAD - SEA
Nonstop5h 59mDelta
Deal found 26/10£186
Fri 12/1208:10SEA - IAD
Nonstop5h 08mUnited Airlines
Mon 15/1217:55IAD - SEA
Nonstop5h 59mUnited Airlines
Deal found 28/10£191
Fri 5/1213:56SEA - DCA
Nonstop5h 03mAlaska Airlines
Sun 7/1208:00DCA - SEA
Nonstop6h 11mAlaska Airlines
Deal found 28/10£192
Wed 3/1207:20SEA - DCA
1 stop10h 42mAlaska Airlines
Fri 5/1218:59DCA - SEA
1 stop17h 53mAlaska Airlines
Deal found 28/10£192
Tue 9/1219:59SEA - IAD
1 stop18h 31mAlaska Airlines
Thu 11/1217:37IAD - SEA
1 stop9h 35mAlaska Airlines
Deal found 28/10£192
Wed 31/1213:55SEA - DCA
Nonstop5h 04mAlaska Airlines
Tue 20/117:01DCA - SEA
Nonstop6h 06mAlaska Airlines
Deal found 28/10£193
Wed 3/1208:10SEA - IAD
Nonstop5h 08mUnited Airlines
Fri 12/1217:55IAD - SEA
Nonstop5h 59mUnited Airlines
Deal found 27/10£193
Sat 13/1209:25SEA - IAD
1 stop8h 59mUnited Airlines
Thu 8/117:55IAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 26/10£194
Thu 4/1200:38SEA - DCA
1 stop7h 21mAmerican Airlines
Sun 7/1206:30DCA - SEA
1 stop9h 31mAmerican Airlines
Deal found 28/10£195
Fri 5/1205:18SEA - IAD
1 stop8h 00mAmerican Airlines
Sun 7/1214:06IAD - SEA
1 stop9h 50mAmerican Airlines
Deal found 28/10£195
Tue 30/1222:14SEA - IAD
Nonstop4h 59mAlaska Airlines
Sat 10/118:04IAD - SEA
Nonstop6h 04mAlaska Airlines
Deal found 28/10£197
Fri 5/1207:05SEA - DCA
1 stop9h 55mHawaiian Airlines
Sun 7/1208:00DCA - SEA
Nonstop6h 11mHawaiian Airlines
Deal found 28/10£198

Cheap 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 29 October 2025.

Round-trip from

£186

One-way from

£105

Popular in

December

Cheapest in

August

Average price

£306

Good round-trip deal

£548 or less

Good one-way deal

£334 or less
Alaska Airlines
  • Alaska Airlines
  • 1/2-7/2
  • Nonstop
  • 11h 10m total
  • Seattle to Washington, D.C.
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Alaska Airlines
  • Alaska Airlines
  • 30/1
  • Nonstop
  • 5h 04m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£26 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
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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 29 October 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

Sun 25/1

07:15-21:00

1 stop10h 45m

Washington, D.C. Reagan-National

Mon 2/2

09:59-16:54

1 stop9h 55m

£192

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/12

13:56-21:59

Nonstop5h 03m

Washington, D.C. Reagan-National

Mon 8/12

17:00-20:13

Nonstop6h 13m

£193

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 15/2

13:45-21:55

Nonstop5h 10m

Washington, D.C. Reagan-National

Sun 22/2

08:00-10:55

Nonstop5h 55m

£193

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 13/2

13:45-21:55

Nonstop5h 10m

Washington, D.C. Reagan-National

Tue 17/2

17:30-20:25

Nonstop5h 55m

£193

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 31/12

13:55-21:59

Nonstop5h 04m

Washington, D.C. Reagan-National

Mon 19/1

08:00-10:55

Nonstop5h 55m

£193

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 10/2

12:25-23:22

1 stop7h 57m

Washington, D.C. Dulles Intl

Tue 17/2

17:40-23:41

1 stop9h 01m

£195

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 30/12

22:14-06:13

Nonstop4h 59m

Washington, D.C. Dulles Intl

Sun 18/1

18:04-21:08

Nonstop6h 04m

£197

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 30/12

22:14-06:13

Nonstop4h 59m

Washington, D.C. Dulles Intl

Thu 22/1

18:04-21:08

Nonstop6h 04m

£197

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 10/3

21:55-05:55

Nonstop5h 00m

Washington, D.C. Dulles Intl

Wed 11/3

18:55-21:40

Nonstop5h 45m

£208

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 14/2

10:55-20:59

1 stop7h 04m

Washington, D.C. Reagan-National

Fri 20/2

14:00-19:03

1 stop8h 03m

£211

Flights are sorted by cheapest return flights first.

Deals found on 28/10

Showing 1-10 of 43 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 24 October 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 60 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 £88). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £164). 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 29 October 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.

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

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

    Hawaiian Airlines, Alaska Airlines, and United Airlines can get you from Seattle to Washington, D.C. in just under 5h 08m. Your travel time can differ by up to 12h 03m. 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 cheapest airlines to fly from Seattle to Washington, D.C. one-way?

    The cheapet airlines for a one-way flight from Seattle to Washington, D.C. are Delta (£105), Alaska Airlines (£112), and United Airlines (£112).

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

    Consider STARLUX Airlines (100%), Avianca (98%) or Lufthansa (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 £88). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of £164). 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
Tysons

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How does Cheapflights help users find flights from Seattle to Washington, D.C.?

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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