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Cheap flights from Seattle to Washington, D.C. from £116

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 30/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in August or March, booked 60 days in advance, depart on a Monday or Tuesday and return on a Monday

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 18 September 2025.

Round-trip from

£188

One-way from

£116

Popular in

December

Cheapest in

August

Average price

£306
Alaska Airlines
  • Alaska Airlines
  • 9/1-18/1
  • Nonstop
  • 11h 05m total
  • Seattle to Washington, D.C.
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Hawaiian Airlines
  • Hawaiian Airlines
  • 6/12
  • 1 total stop
  • 10h 55m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£23 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£6 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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Find flight deals from Seattle to Washington, D.C.

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 18 September 2025.

Fri 5/1213:56SEA - DCA
Nonstop5h 03mAlaska Airlines
Sun 7/1208:00DCA - SEA
Nonstop5h 55mAlaska Airlines
Deal found 17/9£188
Wed 22/1016:20SEA - IAD
Nonstop5h 03mAlaska Airlines
Sun 9/1107:43IAD - SEA
Nonstop5h 52mAlaska Airlines
Deal found 17/9£188
Sat 1/1112:58SEA - DCA
1 stop21h 06mFrontier
Sat 8/1118:00DCA - SEA
2 stops19h 48mFrontier
Deal found 17/9£191
Wed 22/1009:10SEA - DCA
1 stop8h 25mSouthwest
Tue 28/1006:00DCA - SEA
2 stops9h 35mSouthwest
Deal found 16/9£192
Wed 8/1016:48SEA - IAD
Nonstop4h 52mDelta
Wed 15/1007:35IAD - SEA
Nonstop5h 53mDelta
Deal found 17/9£192
Tue 21/1007:25SEA - DCA
Nonstop5h 03mDelta
Sat 25/1016:59DCA - SEA
Nonstop5h 51mDelta
Deal found 16/9£196
Wed 15/1008:00SEA - IAD
Nonstop5h 09mUnited Airlines
Sat 18/1008:20IAD - SEA
1 stop10h 25mUnited Airlines
Deal found 17/9£196
Tue 7/1007:00SEA - IAD
1 stop8h 52mUnited Airlines
Tue 14/1017:55IAD - SEA
Nonstop5h 49mUnited Airlines
Deal found 16/9£196
Fri 14/1119:13SEA - IAD
1 stop7h 03mUnited Airlines
Sat 15/1108:25IAD - SEA
1 stop8h 29mUnited Airlines
Deal found 15/9£199
Tue 21/1020:10SEA - IAD
1 stop17h 32mAlaska Airlines
Fri 24/1019:41IAD - SEA
Nonstop5h 49mAlaska Airlines
Deal found 17/9£200
Tue 9/1207:20SEA - DCA
1 stop10h 42mHawaiian Airlines
Thu 11/1208:59DCA - SEA
1 stop11h 22mHawaiian Airlines
Deal found 16/9£202
Wed 24/1223:15SEA - DCA
1 stop13h 45mAlaska Airlines
Mon 5/117:07DCA - SEA
1 stop9h 08mAlaska Airlines
Deal found 17/9£203

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 18 September 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

Fri 9/1

13:45-21:55

Nonstop5h 10m

Washington, D.C. Reagan-National

Tue 20/1

17:30-20:25

Nonstop5h 55m

£188

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 24/10

13:46-21:59

Nonstop5h 13m

Washington, D.C. Reagan-National

Sat 1/11

17:00-20:03

Nonstop6h 03m

£188

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 31/10

16:48-00:40

Nonstop4h 52m

Washington, D.C. Dulles Intl

Mon 3/11

07:35-10:28

Nonstop5h 53m

£188

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 16/10

08:00-16:09

Nonstop5h 09m

Washington, D.C. Dulles Intl

Sat 18/10

13:05-15:52

Nonstop5h 47m

£188

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 6/1

08:00-16:07

Nonstop5h 07m

Washington, D.C. Reagan-National

Wed 21/1

17:30-20:25

Nonstop5h 55m

£188

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 10/1

15:15-23:16

Nonstop5h 01m

Washington, D.C. Dulles Intl

Mon 19/1

07:00-10:04

Nonstop6h 04m

£188

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 8/1

13:45-21:55

Nonstop5h 10m

Washington, D.C. Reagan-National

Wed 21/1

17:30-20:25

Nonstop5h 55m

£188

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 1/11

16:48-00:40

Nonstop4h 52m

Washington, D.C. Dulles Intl

Sat 8/11

07:35-10:28

Nonstop5h 53m

£188

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 8/1

08:00-16:15

Nonstop5h 15m

Washington, D.C. Reagan-National

Mon 19/1

17:30-20:25

Nonstop5h 55m

£188

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 7/1

09:55-17:55

Nonstop5h 00m

Washington, D.C. Dulles Intl

Sun 18/1

18:55-21:40

Nonstop5h 45m

£188

Flights are sorted by cheapest return flights first.

Deals found on 16/9

Showing 1-10 of 45 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 12 September 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, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £599). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of £947). 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 18 September 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Washington, D.C. as you normally would.

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 18 September 2025.

The most flights from SEA to WAS are scheduled on a Thursday (37 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (28 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 33 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 will be generally consistent. Airlines will cover a distance of 2299 mi. Most flights are nonstop.

  • 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 Hawaiian Airlines (£116), Alaska Airlines (£116), and Southwest (£116).

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

    Consider Austrian Airlines (89%), Brussels Airlines (89%) or Avianca (84%) 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 £599). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of £947). 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
College Park
Tysons

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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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