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Cheap flights from Seattle to Washington, D.C. from C$ 202

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
5 Jul — 12 Jul1
1 adult

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in September or March, booked 90 days in advance, depart on a Thursday or Friday and return on a Wednesday

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 30 June 2025.

Round-trip from

C$ 379

One-way from

C$ 202

Popular in

December

Cheapest in

September

Average price

C$ 637

Good round-trip deal

C$ 657 or less

Good one-way deal

C$ 187 or less
Delta
  • Delta
  • 20/8-27/8
  • Nonstop
  • 10h 56m total
  • Seattle to Washington, D.C.
Hawaiian Airlines
  • Hawaiian Airlines
  • 9/9
  • 1 total stop
  • 10h 59m total
  • Seattle to Washington, D.C.
Highest demand for flights based on searches. 7% potential increase in price (C$ 63 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease (C$ 21 potential savings vs. average RT price).
Average for round-trip flights in June 2025
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).

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 30 June 2025.

Wed 20/87:20 a.m.SEA - DCA
Nonstop5h 05mDelta
Wed 27/84:59 p.m.DCA - SEA
Nonstop5h 51mDelta
Deal found 30/6C$ 379
Wed 20/84:20 p.m.SEA - IAD
Nonstop5h 00mHawaiian Airlines
Wed 27/86:09 p.m.IAD - SEA
Nonstop5h 42mHawaiian Airlines
Deal found 30/6C$ 379
Thu 7/811:30 p.m.SEA - IAD
Nonstop4h 57mAlaska Airlines
Tue 19/86:13 p.m.IAD - SEA
Nonstop5h 47mAlaska Airlines
Deal found 29/6C$ 393
Wed 6/89:14 p.m.SEA - DCA
1 stop7h 49mJetBlue
Wed 13/81:44 p.m.DCA - SEA
1 stop11h 15mJetBlue
Deal found 29/6C$ 395
Sat 30/88:35 a.m.SEA - DCA
Nonstop5h 14mHawaiian Airlines
Sun 31/88:00 a.m.DCA - SEA
Nonstop5h 49mHawaiian Airlines
Deal found 30/6C$ 398
Wed 15/107:52 a.m.SEA - DCA
1 stop9h 37mAlaska Airlines
Tue 21/105:48 p.m.DCA - SEA
1 stop8h 16mAlaska Airlines
Deal found 30/6C$ 405
Wed 20/85:35 a.m.SEA - DCA
1 stop6h 35mSouthwest
Wed 20/84:40 p.m.DCA - SEA
2 stops9h 30mSouthwest
Deal found 28/6C$ 413
Wed 20/812:10 p.m.SEA - IAD
1 stop6h 55mSouthwest
Tue 26/82:25 p.m.IAD - SEA
2 stops12h 40mSouthwest
Deal found 28/6C$ 413
Thu 14/811:59 p.m.SEA - IAD
1 stop8h 56mSun Country Air
Sun 17/812:40 p.m.IAD - SEA
1 stop22h 22mSun Country Air
Deal found 30/6C$ 417
Wed 6/812:20 a.m.SEA - IAD
1 stop8h 35mUnited Airlines
Sat 16/81:05 p.m.IAD - SEA
Nonstop5h 48mUnited Airlines
Deal found 29/6C$ 421
Thu 28/89:55 p.m.SEA - IAD
Nonstop5h 00mDelta
Mon 1/97:35 a.m.IAD - SEA
Nonstop5h 45mDelta
Deal found 30/6C$ 434
Wed 23/712:20 a.m.SEA - DCA
1 stop7h 36mUnited Airlines
Fri 1/86:25 a.m.DCA - SEA
1 stop8h 12mUnited Airlines
Deal found 30/6C$ 531

Cheapflights Fare Finder

Customize 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 629,999 searches. Data last updated 30 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 20/8

7:20 a.m.-3:25 p.m.

Nonstop5h 05m

Washington, D.C. Reagan-National

Wed 27/8

4:59 p.m.-7:50 p.m.

Nonstop5h 51m

C$ 379

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 20/8

4:20 p.m.-12:20 a.m.

Nonstop5h 00m

Washington, D.C. Dulles Intl

Wed 27/8

6:09 p.m.-8:51 p.m.

Nonstop5h 42m

C$ 379

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 7/8

11:30 p.m.-7:27 a.m.

Nonstop4h 57m

Washington, D.C. Dulles Intl

Tue 19/8

6:13 p.m.-9:00 p.m.

Nonstop5h 47m

C$ 393

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 6/8

9:14 p.m.-8:03 a.m.

1 stop7h 49m

Washington, D.C. Reagan-National

Wed 13/8

1:44 p.m.-9:59 p.m.

1 stop11h 15m

C$ 395

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 30/8

8:35 a.m.-4:49 p.m.

Nonstop5h 14m

Washington, D.C. Reagan-National

Sun 31/8

8:00 a.m.-10:49 a.m.

Nonstop5h 49m

C$ 398

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 15/10

7:52 a.m.-8:29 p.m.

1 stop9h 37m

Washington, D.C. Reagan-National

Tue 21/10

5:48 p.m.-11:04 p.m.

1 stop8h 16m

C$ 405

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 20/8

5:35 a.m.-3:10 p.m.

1 stop6h 35m

Washington, D.C. Reagan-National

Wed 20/8

4:40 p.m.-11:10 p.m.

2 stops9h 30m

C$ 413

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 20/8

12:10 p.m.-10:05 p.m.

1 stop6h 55m

Washington, D.C. Dulles Intl

Tue 26/8

2:25 p.m.-12:05 a.m.

2 stops12h 40m

C$ 413

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 14/8

11:59 p.m.-11:55 a.m.

1 stop8h 56m

Washington, D.C. Dulles Intl

Sun 17/8

12:40 p.m.-8:02 a.m.

1 stop22h 22m

C$ 417

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 6/8

12:20 a.m.-11:55 a.m.

1 stop8h 35m

Washington, D.C. Dulles Intl

Sat 16/8

1:05 p.m.-3:53 p.m.

Nonstop5h 48m

C$ 421

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/6

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 round-trip 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 round-trip flight from Seattle to Washington, D.C.. Price data was last updated on 27 June 2025.

Booking 90 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Washington, D.C.. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 C$ 256). Flying from Seattle to Washington, D.C. in October is currently the most expensive (average of C$ 352). 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 30 June 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 64% on flights from Seattle to Washington, D.C. by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Seattle to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Washington, D.C.. Price data was last updated on 29 June 2025.

Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Monday evenings when fares are most often at their lowest. Thursday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 30 June 2025.

The most flights from SEA to WAS are scheduled on a Monday (40 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (30 on average).

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 30 June 2025.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Alaska Airlines,Southwest, andDelta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

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

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

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

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
8.0
Very good

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

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

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

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

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

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.?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to Washington, D.C.. You should not have trouble finding flights to Washington, D.C. from Seattle/Tacoma Intl; the airport handles an average of 37 outbound flights to Washington, D.C. per day. You should also have plenty of airline options to choose from since 1 airline has flights from the Seattle airport to Washington, D.C.. It is only a 18.4 km journey to Seattle/Tacoma Intl (SEA) from Seattle’s city centre.

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

    Currently priced at C$ 379, Delta will fly you from Seattle to Washington, D.C. and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Hawaiian Airlines and Alaska Airlines - these airlines can fly you to your destination from C$ 379 and C$ 393, respectively. These flights start at 29% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Seattle to Washington, D.C. one-way?

    For one-way options, check prices for Hawaiian Airlines. According to our data, you can fly for as low as C$ 202. Users have also found prices from C$ 202 and C$ 204 on Alaska Airlines and Delta, respectively.

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

    Before booking your flight to Washington, D.C. from Seattle, check out the most reliable airlines to get you to your destination on time: Avianca (93%), Copa Airlines (89%), ANA( 88%).

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

    Looking for the cheapest flight from Seattle to Washington, D.C.? While on average our users pay C$ 540, our data indicates the cheapest price to be C$ 187. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), is priced around C$ 513.

  • 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 vacation 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 C$ 256). Flying from Seattle to Washington, D.C. in October is currently the most expensive (average of C$ 352). 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
Herndon
Arlington
Hanover
Reston
Fairfax
Ellicott City
Gaithersburg
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Alternative routes for Seattle to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Seattle to Washington, D.C.

Discover the top airline that operate flights from Seattle to Washington, D.C.. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 30 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 252AverageC$ 468FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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How does Cheapflights help users find flights from Seattle to Washington, D.C.?

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Washington, D.C.?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Washington, D.C. for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Washington, D.C. with no change fees?

Yes, we can. To see specific flights from Seattle to Washington, D.C. with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Washington, D.C. become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Washington, D.C. flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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