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Cheap flights from Seattle to Washington, D.C. from £111

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 2/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
3 Apr — 10 Apr1
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 29 March 2025.

Round-trip from

£208

One-way from

£111

Popular in

December

Cheapest in

September

Average price

£295

Good round-trip deal

£711 or less

Good one-way deal

£146 or less
JetBlue
  • JetBlue
  • 1/7-9/7
  • 2 total stops
  • 21h 21m total
  • Seattle to Washington, D.C.
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Delta
  • Delta
  • 2/5
  • Nonstop
  • 5h 06m total
  • Seattle to Washington, D.C.
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Highest demand for flights based on searches. 5% potential increase in price (£14 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 March 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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Price to beat on a one-way 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 29 March 2025.

Tue 1/721:50SEA - DCA
1 stop8h 51mJetBlue
Wed 9/712:40DCA - SEA
1 stop12h 30mJetBlue
Deal found 29/3£208
Fri 18/407:25SEA - DCA
Nonstop5h 06mDelta
Tue 22/416:50DCA - SEA
Nonstop6h 01mDelta
Deal found 28/3£222
Thu 1/522:30SEA - IAD
Nonstop4h 50mDelta
Sun 4/507:25IAD - SEA
Nonstop5h 55mDelta
Deal found 28/3£222
Fri 9/508:24SEA - DCA
Nonstop5h 14mHawaiian Airlines
Wed 21/509:59DCA - SEA
1 stop11h 52mHawaiian Airlines
Deal found 28/3£229
Thu 1/515:36SEA - IAD
1 stop11h 04mAlaska Airlines
Tue 6/510:00IAD - SEA
Nonstop5h 40mAlaska Airlines
Deal found 28/3£229
Thu 17/423:50SEA - IAD
1 stop8h 33mSun Country Air
Thu 24/412:37IAD - SEA
1 stop24h 55mSun Country Air
Deal found 28/3£236
Fri 9/507:00SEA - DCA
1 stop10h 58mAlaska Airlines
Wed 21/509:59DCA - SEA
1 stop11h 52mAlaska Airlines
Deal found 28/3£236
Tue 29/407:08SEA - DCA
2 stops10h 57mUnited Airlines
Wed 30/414:00DCA - SEA
1 stop8h 01mUnited Airlines
Deal found 27/3£241
Fri 18/410:00SEA - IAD
Nonstop4h 59mHawaiian Airlines
Sun 27/406:30IAD - SEA
Nonstop5h 43mHawaiian Airlines
Deal found 28/3£256
Fri 18/408:15SEA - IAD
Nonstop5h 07mUnited Airlines
Sun 20/417:30IAD - SEA
Nonstop5h 51mUnited Airlines
Deal found 28/3£279
Thu 12/622:40SEA - DCA
2 stops10h 55mSouthwest
Tue 17/615:55DCA - SEA
1 stop10h 20mSouthwest
Deal found 28/3£280
Sat 3/505:10SEA - IAD
1 stop7h 05mSouthwest
Sun 11/519:00IAD - SEA
1 stop9h 20mSouthwest
Deal found 28/3£287

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 March 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

Tue 1/7

21:50-09:41

1 stop8h 51m

Washington, D.C. Reagan-National

Wed 9/7

12:40-22:10

1 stop12h 30m

£208

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 18/4

07:25-15:31

Nonstop5h 06m

Washington, D.C. Reagan-National

Tue 22/4

16:50-19:51

Nonstop6h 01m

£222

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 1/5

22:30-06:20

Nonstop4h 50m

Washington, D.C. Dulles Intl

Sun 4/5

07:25-10:20

Nonstop5h 55m

£222

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/5

08:24-16:38

Nonstop5h 14m

Washington, D.C. Reagan-National

Wed 21/5

09:59-18:51

1 stop11h 52m

£229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 1/5

15:36-05:40

1 stop11h 04m

Washington, D.C. Dulles Intl

Tue 6/5

10:00-12:40

Nonstop5h 40m

£229

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 17/4

23:50-11:23

1 stop8h 33m

Washington, D.C. Dulles Intl

Thu 24/4

12:37-10:32

1 stop24h 55m

£236

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/5

07:00-20:58

1 stop10h 58m

Washington, D.C. Reagan-National

Wed 21/5

09:59-18:51

1 stop11h 52m

£236

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 29/4

07:08-21:05

2 stops10h 57m

Washington, D.C. Reagan-National

Wed 30/4

14:00-19:01

1 stop8h 01m

£241

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 18/4

10:00-17:59

Nonstop4h 59m

Washington, D.C. Dulles Intl

Sun 27/4

06:30-09:13

Nonstop5h 43m

£256

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 18/4

08:15-16:22

Nonstop5h 07m

Washington, D.C. Dulles Intl

Sun 20/4

17:30-20:21

Nonstop5h 51m

£279

Flights are sorted by cheapest return flights first.

Deals found on 28/3

Showing 1-10 of 25 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 21 March 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, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £565). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of £946). 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 March 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 29 March 2025.

The most flights from SEA to WAS are scheduled on a Friday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 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 29 March 2025.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Southwest, Alaska Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very Good
4,273 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very Good
4,273 reviews
Southwest
8.1
Very Good
4,273 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very Good
9,797 reviews
Southwest
8.1
Very Good
4,273 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very Good
7,895 reviews
Southwest
8.1
Very Good
4,273 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Hawaiian Airlines
7.9
Good
2,335 reviews
Southwest
8.1
Very Good
4,273 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,609 reviews
Southwest
8.1
Very Good
4,273 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 popular is this Seattle to Washington, D.C. flight route?

    Flights from Seattle/Tacoma Intl to Washington, D.C. have been viewed 2 times in the past calendar month.

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

    Flying on JetBlue is currently your cheapest option to Washington, D.C., with prices starting at £208. Additional return tickets that might be worth considering are offered by Delta and Alaska Airlines, with the lowest prices starting at £222 and £229, respectively. JetBlue is 33% 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 Delta (£111), JetBlue (£112), and Alaska Airlines (£115).

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

    Consider Alaska Airlines (81%), Air Tahiti Nui (81%) or Hawaiian Airlines (72%) 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, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of £565). Flying from Seattle to Washington, D.C. in July is currently the most expensive (average of £946). 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.

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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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