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Cheap flights from Seattle to Washington, D.C. from £102

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 23/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
18 Jun — 25 Jun1
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 13 June 2025.

Round-trip from

£204

One-way from

£102

Popular in

December

Cheapest in

September

Average price

£336

Good round-trip deal

£362 or less

Good one-way deal

£743 or less
Delta
  • Delta
  • 3/9-7/10
  • Nonstop
  • 11h 15m total
  • Seattle to Washington, D.C.
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Hawaiian Airlines
  • Hawaiian Airlines
  • 23/9
  • Nonstop
  • 5h 09m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£17 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 June 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 13 June 2025.

Wed 3/907:20SEA - DCA
Nonstop5h 09mDelta
Tue 7/1016:40DCA - SEA
Nonstop6h 06mDelta
Deal found 12/6£204
Wed 22/1015:15SEA - IAD
Nonstop5h 00mDelta
Tue 28/1007:00IAD - SEA
Nonstop6h 05mDelta
Deal found 13/6£204
Wed 12/1109:25SEA - IAD
1 stop8h 41mUnited Airlines
Sat 15/1117:55IAD - SEA
Nonstop5h 59mUnited Airlines
Deal found 11/6£208
Tue 2/909:53SEA - DCA
1 stop9h 06mAlaska Airlines
Sat 13/917:06DCA - SEA
Nonstop5h 50mAlaska Airlines
Deal found 11/6£211
Thu 30/1022:29SEA - DCA
1 stop9h 15mJetBlue
Mon 3/1114:00DCA - SEA
1 stop10h 19mJetBlue
Deal found 13/6£213
Tue 7/1022:54SEA - DCA
1 stop7h 27mUnited Airlines
Wed 8/1015:30DCA - SEA
1 stop10h 00mUnited Airlines
Deal found 11/6£215
Fri 11/723:59SEA - IAD
1 stop8h 44mSun Country Air
Fri 3/1018:30IAD - SEA
1 stop25h 31mSun Country Air
Deal found 13/6£217
Wed 8/1007:55SEA - DCA
1 stop9h 34mHawaiian Airlines
Wed 15/1008:59DCA - SEA
1 stop11h 35mHawaiian Airlines
Deal found 11/6£218
Wed 24/918:59SEA - IAD
1 stop18h 48mAlaska Airlines
Sat 11/1018:03IAD - SEA
1 stop18h 17mAlaska Airlines
Deal found 11/6£218
Tue 9/923:10SEA - DCA
1 stop7h 50mSouthwest
Wed 17/915:35DCA - SEA
2 stops10h 35mSouthwest
Deal found 11/6£222
Wed 10/906:45SEA - IAD
2 stops12h 20mSouthwest
Mon 15/918:50IAD - SEA
1 stop7h 45mSouthwest
Deal found 11/6£222
Fri 22/815:25SEA - IAD
1 stop12h 05mFrontier
Thu 28/808:00IAD - SEA
1 stop9h 40mFrontier
Deal found 12/6£230

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 13 June 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 3/9

07:20-15:29

Nonstop5h 09m

Washington, D.C. Reagan-National

Tue 7/10

16:40-19:46

Nonstop6h 06m

£204

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 22/10

15:15-23:15

Nonstop5h 00m

Washington, D.C. Dulles Intl

Tue 28/10

07:00-10:05

Nonstop6h 05m

£204

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 12/11

09:25-21:06

1 stop8h 41m

Washington, D.C. Dulles Intl

Sat 15/11

17:55-20:54

Nonstop5h 59m

£208

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 2/9

09:53-21:59

1 stop9h 06m

Washington, D.C. Reagan-National

Sat 13/9

17:06-19:56

Nonstop5h 50m

£211

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 30/10

22:29-10:44

1 stop9h 15m

Washington, D.C. Reagan-National

Mon 3/11

14:00-21:19

1 stop10h 19m

£213

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 7/10

22:54-09:21

1 stop7h 27m

Washington, D.C. Reagan-National

Wed 8/10

15:30-22:30

1 stop10h 00m

£215

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 11/7

23:59-11:43

1 stop8h 44m

Washington, D.C. Dulles Intl

Fri 3/10

18:30-17:01

1 stop25h 31m

£217

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 24/9

18:59-16:47

1 stop18h 48m

Washington, D.C. Dulles Intl

Sat 11/10

18:03-09:20

1 stop18h 17m

£218

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 4/7

08:34-16:43

Nonstop5h 09m

Washington, D.C. Reagan-National

Tue 8/7

08:00-10:56

Nonstop5h 56m

£219

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 9/9

22:45-12:00

1 stop10h 15m

Washington, D.C. Reagan-National

Tue 16/9

16:30-23:10

2 stops9h 40m

£222

Flights are sorted by cheapest return flights first.

Deals found on 11/6

Showing 1-10 of 29 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 9 June 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 13 June 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 13 June 2025.

The most flights from SEA to WAS are scheduled on a Thursday (41 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (26 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 13 June 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
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
10,000 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
4,286 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
7,946 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
2,496 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
8,790 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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 32 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 Delta is currently your cheapest option to Washington, D.C., with prices starting at £204. Additional return tickets that might be worth considering are offered by United Airlines and Alaska Airlines, with the lowest prices starting at £208 and £211, respectively. Delta is 30% 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 (£102), United Airlines (£102), and Sun Country Air (£109).

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

    Consider Hawaiian Airlines (74%), Air Tahiti Nui (73%) or Alaska Airlines (61%) 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.

See more FAQs

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Silver Spring
Arlington
Woodbridge
Hanover
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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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