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Cheap flights from Seattle to Washington, D.C. from £108

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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
1 May — 8 May1
1 adult

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 26 April 2025.

Round-trip from

£172

One-way from

£108

Popular in

December

Cheapest in

September

Average price

£295

Good round-trip deal

£691 or less
Frontier
  • Frontier
  • 10/5-19/5
  • 2 total stops
  • 17h 43m total
  • Seattle to Washington, D.C.
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Hawaiian Airlines
  • Hawaiian Airlines
  • 19/5
  • Nonstop
  • 4h 59m total
  • Seattle to Washington, D.C.
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Highest demand for flights based on searches. 6% potential increase in price (£16 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£7 potential savings vs. average return price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
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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 26 April 2025.

Sat 10/506:00SEA - DCA
1 stop7h 59mFrontier
Mon 19/518:00DCA - SEA
1 stop9h 44mFrontier
Deal found 24/4£172
Wed 28/509:18SEA - IAD
Nonstop4h 57mHawaiian Airlines
Wed 28/518:15IAD - SEA
Nonstop5h 45mHawaiian Airlines
Deal found 25/4£189
Sat 7/607:35SEA - DCA
Nonstop5h 14mDelta
Tue 10/616:40DCA - SEA
Nonstop5h 58mDelta
Deal found 25/4£193
Wed 21/523:30SEA - IAD
Nonstop5h 06mAlaska Airlines
Wed 28/518:15IAD - SEA
Nonstop5h 45mAlaska Airlines
Deal found 26/4£193
Wed 21/513:48SEA - DCA
Nonstop5h 11mAlaska Airlines
Tue 27/518:38DCA - SEA
1 stop17h 31mAlaska Airlines
Deal found 24/4£201
Sat 31/521:50SEA - IAD
Nonstop5h 02mDelta
Sat 7/607:45IAD - SEA
Nonstop5h 48mDelta
Deal found 25/4£208
Mon 9/622:15SEA - IAD
Nonstop4h 57mUnited Airlines
Tue 10/608:25IAD - SEA
1 stop13h 28mUnited Airlines
Deal found 25/4£225
Fri 27/619:15SEA - IAD
1 stop23h 22mSun Country Air
Mon 30/612:28IAD - SEA
1 stop13h 22mSun Country Air
Deal found 25/4£244
Wed 13/808:34SEA - DCA
Nonstop5h 09mHawaiian Airlines
Mon 18/817:02DCA - SEA
Nonstop5h 58mHawaiian Airlines
Deal found 24/4£253
Fri 9/518:52SEA - IAD
1 stop8h 39mFrontier
Mon 19/507:45IAD - SEA
1 stop13h 15mFrontier
Deal found 24/4£256
Sat 10/513:50SEA - DCA
Nonstop5h 09mMultiple Airlines
Tue 20/513:00DCA - SEA
1 stop13h 49mMultiple Airlines
Deal found 24/4£259
Thu 21/822:45SEA - DCA
1 stop9h 20mSouthwest
Sat 30/814:00DCA - SEA
2 stops10h 30mSouthwest
Deal found 25/4£272

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 April 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

Sat 10/5

06:00-16:59

1 stop7h 59m

Washington, D.C. Reagan-National

Mon 19/5

18:00-00:44

1 stop9h 44m

£172

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 28/5

09:18-17:15

Nonstop4h 57m

Washington, D.C. Dulles Intl

Wed 28/5

18:15-21:00

Nonstop5h 45m

£189

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 7/6

07:35-15:49

Nonstop5h 14m

Washington, D.C. Reagan-National

Tue 10/6

16:40-19:38

Nonstop5h 58m

£193

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 21/5

23:30-07:36

Nonstop5h 06m

Washington, D.C. Dulles Intl

Wed 28/5

18:15-21:00

Nonstop5h 45m

£193

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 21/5

13:48-21:59

Nonstop5h 11m

Washington, D.C. Reagan-National

Tue 27/5

18:38-09:09

1 stop17h 31m

£201

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 31/5

21:50-05:52

Nonstop5h 02m

Washington, D.C. Dulles Intl

Sat 7/6

07:45-10:33

Nonstop5h 48m

£208

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 9/6

22:15-06:12

Nonstop4h 57m

Washington, D.C. Dulles Intl

Tue 10/6

08:25-18:53

1 stop13h 28m

£225

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 27/6

19:15-21:37

1 stop23h 22m

Washington, D.C. Dulles Intl

Mon 30/6

12:28-22:50

1 stop13h 22m

£244

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 13/8

08:34-16:43

Nonstop5h 09m

Washington, D.C. Reagan-National

Mon 18/8

17:02-20:00

Nonstop5h 58m

£253

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 9/5

18:52-06:31

1 stop8h 39m

Washington, D.C. Dulles Intl

Mon 19/5

07:45-18:00

1 stop13h 15m

£256

Flights are sorted by cheapest return flights first.

Deals found on 25/4

Showing 1-10 of 28 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 18 April 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 90 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 26 April 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 26 April 2025.

The most flights from SEA to WAS are scheduled on a Thursday (37 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 on average).

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. when rainfall is around 66.0 mm.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C., use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington, D.C.. Reviews last updated 26 April 2025.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Alaska Airlines, Southwest and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very Good
9,928 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Alaska Airlines
8.0
Very Good
9,928 reviews
Alaska Airlines
8.0
Very Good
9,928 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Southwest
8.0
Very Good
4,287 reviews
Alaska Airlines
8.0
Very Good
9,928 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Delta
8.0
Very Good
7,920 reviews
Alaska Airlines
8.0
Very Good
9,928 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Hawaiian Airlines
7.9
Good
2,395 reviews
Alaska Airlines
8.0
Very Good
9,928 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
United Airlines
7.4
Good
8,688 reviews
Alaska Airlines
8.0
Very Good
9,928 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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

  • What are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?

    Flying on Frontier is currently your cheapest option to Washington, D.C., with prices starting at £172. Additional return tickets that might be worth considering are offered by Hawaiian Airlines and Delta, with the lowest prices starting at £189 and £193, respectively. Frontier is 43% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 (£108), Alaska Airlines (£115), and Delta (£116).

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

    Consider Ethiopian Air (93%), Lufthansa (92%) or Austrian Airlines (92%) when booking your flight. These represent the most reliable airlines when flying from Seattle to Washington, D.C..

  • What are the cheapest flights from Seattle to Washington, D.C.?

    The cheapest flight price from Seattle to Washington, D.C. is £680. On average you can expect to pay £697. The most popular route, (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), can usually be booked for £178.

  • 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

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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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