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Cheap flights from Seattle to Washington, D.C. from £114

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 20/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
26 Feb — 5 Mar1
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 21 February 2025.

Round-trip from

£223

One-way from

£114

Popular in

December

Cheapest in

September

Average price

£299

Good round-trip deal

£729 or less
Delta
  • Delta
  • 28/3-8/4
  • 2 total stops
  • 27h 11m total
  • Seattle to Washington, D.C.
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Alaska Airlines
  • Alaska Airlines
  • 20/3
  • Nonstop
  • 4h 51m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£15 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
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Average for round-trip flights in February 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 21 February 2025.

Fri 28/300:49SEA - IAD
1 stop19h 38mDelta
Tue 8/406:00IAD - SEA
1 stop7h 33mDelta
Deal found 20/2£223
Fri 7/323:48SEA - DCA
1 stop11h 10mJetBlue
Tue 11/315:50DCA - SEA
1 stop9h 48mJetBlue
Deal found 20/2£223
Mon 7/422:55SEA - DCA
1 stop9h 31mDelta
Mon 14/409:46DCA - SEA
1 stop7h 41mDelta
Deal found 21/2£227
Sat 26/408:15SEA - IAD
Nonstop5h 07mUnited Airlines
Thu 1/517:25IAD - SEA
1 stop8h 26mUnited Airlines
Deal found 20/2£228
Fri 11/419:55SEA - IAD
1 stop17h 35mAlaska Airlines
Wed 16/407:00IAD - SEA
Nonstop5h 52mAlaska Airlines
Deal found 20/2£230
Fri 7/305:00SEA - IAD
1 stop6h 50mSouthwest
Mon 17/319:50IAD - SEA
1 stop8h 00mSouthwest
Deal found 19/2£231
Wed 19/306:39SEA - DCA
1 stop8h 19mAlaska Airlines
Thu 27/308:00DCA - SEA
1 stop9h 45mAlaska Airlines
Deal found 21/2£242
Wed 23/406:00SEA - DCA
1 stop9h 10mSouthwest
Tue 29/415:30DCA - SEA
2 stops11h 00mSouthwest
Deal found 21/2£247
Tue 1/717:00SEA - IAD
1 stop9h 55mHawaiian Airlines
Tue 5/807:00IAD - SEA
1 stop9h 52mHawaiian Airlines
Deal found 20/2£266
Thu 24/418:25SEA - IAD
1 stop14h 58mSun Country Air
Mon 28/411:37IAD - SEA
1 stop8h 22mSun Country Air
Deal found 20/2£273
Wed 19/323:59SEA - DCA
1 stop6h 21mUnited Airlines
Mon 24/311:30DCA - SEA
2 stops12h 45mUnited Airlines
Deal found 20/2£299
Fri 7/314:05SEA - DCA
Nonstop4h 54mHawaiian Airlines
Mon 10/317:25DCA - SEA
Nonstop6h 10mHawaiian Airlines
Deal found 21/2£347

Find flights from Seattle to Washington, D.C. within your budget

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 21 February 2025.

Fly from

Seattle

Fly to

Washington, D.C.

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 28/3

00:49-23:27

1 stop19h 38m

Washington, D.C. Dulles Intl

Tue 8/4

06:00-10:33

1 stop7h 33m

£223

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 7/3

23:48-13:58

1 stop11h 10m

Washington, D.C. Reagan-National

Tue 11/3

15:50-22:38

1 stop9h 48m

£223

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 7/4

22:55-11:26

1 stop9h 31m

Washington, D.C. Reagan-National

Mon 14/4

09:46-14:27

1 stop7h 41m

£227

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 26/4

08:15-16:22

Nonstop5h 07m

Washington, D.C. Dulles Intl

Thu 1/5

17:25-22:51

1 stop8h 26m

£228

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 11/4

19:55-16:30

1 stop17h 35m

Washington, D.C. Dulles Intl

Wed 16/4

07:00-09:52

Nonstop5h 52m

£230

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 7/3

05:00-14:50

1 stop6h 50m

Washington, D.C. Dulles Intl

Mon 17/3

19:50-00:50

1 stop8h 00m

£231

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 19/3

06:39-17:58

1 stop8h 19m

Washington, D.C. Reagan-National

Thu 27/3

08:00-14:45

1 stop9h 45m

£242

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 23/4

06:00-18:10

1 stop9h 10m

Washington, D.C. Reagan-National

Tue 29/4

15:30-23:30

2 stops11h 00m

£247

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/7

17:00-05:55

1 stop9h 55m

Washington, D.C. Dulles Intl

Tue 5/8

07:00-13:52

1 stop9h 52m

£266

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 24/4

18:25-12:23

1 stop14h 58m

Washington, D.C. Dulles Intl

Mon 28/4

11:37-16:59

1 stop8h 22m

£273

Flights are sorted by cheapest return flights first.

Deals found on 20/2

Showing 1-10 of 24 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.

Travel insights for flights from Seattle to Washington, D.C.

Get recent, data-driven insights about flights from Seattle to Washington, D.C. including ideal travel times, pricing trends, and more.

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 14 February 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 41 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 21 February 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 21 February 2025.

The most flights from SEA to WAS are scheduled on a Thursday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 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 21 February 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
4,401 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very Good
4,401 reviews
Southwest
8.1
Very Good
4,401 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very Good
9,697 reviews
Southwest
8.1
Very Good
4,401 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very Good
8,212 reviews
Southwest
8.1
Very Good
4,401 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,315 reviews
Southwest
8.1
Very Good
4,401 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

JetBlue
7.4
Good
3,069 reviews
Southwest
8.1
Very Good
4,401 reviews
Check prices

Comfort

8.1

Entertainment

7.6

Food

7.1

Overall

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 25 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 Delta is currently your cheapest option to Washington, D.C., with prices starting at £223. Additional return tickets that might be worth considering are offered by JetBlue and United Airlines, with the lowest prices starting at £223 and £228, 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 Alaska Airlines (£114), Hawaiian Airlines (£114), and Delta (£118).

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

    Consider China Eastern (90%), Ethiopian Air (90%) or Korean Air (89%) 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 £717. On average you can expect to pay £735. The most popular route, (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), can usually be booked for £172.

  • 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.

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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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