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Cheap flights from Seattle to Washington, D.C. from C$ 176

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 16/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
18 Mar — 25 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in January or July, booked 81 days in advance, depart on a Thursday or Tuesday and return on a Monday

Cheap flight deals from Seattle to Washington, D.C.

Enter your travel dates to find the best prices.

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 16 February 2026.

Tue 31/37:25 a.m.
SEA
-
DCA
Nonstop4h 58m
Delta
Tue 7/412:29 p.m.
DCA
-
SEA
1 stop8h 57m
Delta
Deal found 13/2C$ 282
Thu 30/411:59 p.m.
SEA
-
IAD
1 stop8h 33m
Delta
Sun 3/57:00 a.m.
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 13/2C$ 282
Fri 17/411:15 p.m.
SEA
-
IAD
1 stop7h 35m
Delta
Mon 20/46:37 p.m.
IAD
-
SEA
1 stop8h 16m
Delta
Deal found 13/2C$ 295
Tue 24/35:30 a.m.
SEA
-
DCA
1 stop7h 50m
Southwest
Tue 31/33:35 p.m.
DCA
-
SEA
1 stop11h 20m
Southwest
Deal found 15/2C$ 302
Wed 22/49:20 a.m.
SEA
-
IAD
1 stop11h 20m
Southwest
Mon 4/55:55 p.m.
IAD
-
SEA
1 stop8h 35m
Southwest
Deal found 13/2C$ 302
Wed 22/49:41 p.m.
SEA
-
IAD
Nonstop5h 09m
Alaska Airlines
Fri 1/56:47 p.m.
IAD
-
SEA
1 stop18h 39m
Alaska Airlines
Deal found 13/2C$ 309
Mon 18/511:14 p.m.
SEA
-
IAD
Nonstop5h 09m
United Airlines
Fri 5/67:00 a.m.
IAD
-
SEA
1 stop9h 58m
United Airlines
Deal found 12/2C$ 317
Mon 20/47:30 a.m.
SEA
-
DCA
Nonstop4h 57m
Delta
Fri 24/44:39 p.m.
DCA
-
SEA
Nonstop5h 51m
Delta
Deal found 12/2C$ 323
Wed 18/39:40 p.m.
SEA
-
IAD
Nonstop5h 00m
Alaska Airlines
Sat 21/36:50 p.m.
IAD
-
SEA
Nonstop5h 55m
Alaska Airlines
Deal found 12/2C$ 323
Thu 12/38:00 a.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Sat 21/35:55 p.m.
IAD
-
SEA
Nonstop6h 01m
United Airlines
Deal found 14/2C$ 325
Mon 30/37:00 a.m.
SEA
-
IAD
1 stop9h 23m
United Airlines
Sat 4/45:55 p.m.
IAD
-
SEA
Nonstop5h 58m
United Airlines
Deal found 14/2C$ 328
Mon 9/39:45 p.m.
SEA
-
IAD
1 stop8h 25m
Delta
Wed 11/37:00 a.m.
IAD
-
SEA
Nonstop6h 01m
Delta
Deal found 13/2C$ 336

Find 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 16 February 2026.

Round-trip from

C$ 282

One-way from

C$ 176

Popular in

June

Cheapest in

January

Average price

C$ 528

Good round-trip deal

C$ 886 or less

Good one-way deal

C$ 312 or less
Delta
  • Delta
  • 24/4-28/4
  • 1 total stop
  • 12h 14m total
  • Seattle to Washington, D.C.
Search Deals
Delta
  • Delta
  • 16/3
  • 1 total stop
  • 8h 22m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 10 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
Search Deals

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 16 February 2026.
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 28/4

10:40 p.m.-10:19 a.m.

1 stop8h 39m

Washington, D.C. Reagan-National

Sat 2/5

4:39 p.m.-7:30 p.m.

Nonstop5h 51m

C$ 282

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 17/4

7:30 a.m.-3:27 p.m.

Nonstop4h 57m

Washington, D.C. Reagan-National

Tue 28/4

2:55 p.m.-8:42 p.m.

1 stop8h 47m

C$ 282

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 28/4

6:00 a.m.-5:57 p.m.

1 stop8h 57m

Washington, D.C. Dulles Intl

Sat 2/5

7:00 a.m.-9:54 a.m.

Nonstop5h 54m

C$ 282

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 10/3

7:20 a.m.-7:19 p.m.

1 stop8h 59m

Washington, D.C. Dulles Intl

Tue 17/3

7:00 a.m.-10:03 a.m.

Nonstop6h 03m

C$ 282

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 22/4

3:59 p.m.-11:55 p.m.

Nonstop4h 56m

Washington, D.C. Dulles Intl

Fri 1/5

6:00 a.m.-10:55 a.m.

1 stop7h 55m

C$ 282

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 21/4

10:40 p.m.-12:05 p.m.

1 stop10h 25m

Washington, D.C. Dulles Intl

Fri 1/5

7:00 a.m.-9:54 a.m.

Nonstop5h 54m

C$ 282

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 24/3

11:15 p.m.-11:32 a.m.

1 stop9h 17m

Washington, D.C. Dulles Intl

Wed 1/4

7:00 a.m.-10:03 a.m.

Nonstop6h 03m

C$ 282

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 30/4

11:59 p.m.-11:32 a.m.

1 stop8h 33m

Washington, D.C. Dulles Intl

Sun 3/5

7:00 a.m.-9:54 a.m.

Nonstop5h 54m

C$ 282

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 1/4

5:30 a.m.-4:20 p.m.

1 stop7h 50m

Washington, D.C. Reagan-National

Wed 8/4

7:00 p.m.-12:10 a.m.

1 stop8h 10m

C$ 295

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 23/4

1:55 p.m.-12:20 a.m.

1 stop7h 25m

Washington, D.C. Dulles Intl

Tue 28/4

4:30 p.m.-10:30 p.m.

1 stop9h 00m

C$ 295

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/2

Showing 1-10 of 45 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 13 February 2026.

Booking 81 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, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of C$ 144). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of C$ 285). 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 16 February 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 58% on flights from Seattle to Washington, D.C. by exploring options for tickets in the afternoon.

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 16 February 2026.

The most flights from SEA to WAS are scheduled on a Sunday (28 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 on average).

How much does it cost to fly round-trip from Seattle to Washington, D.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 16 February 2026.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,204 reviews
Check prices

Crew

8.5

Entertainment

7.8

Food

7.2

Boarding

8.1

Overall

7.9

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,204 reviews
Delta
7.9
Good
8,204 reviews
Check prices

Crew

8.5

Entertainment

7.8

Food

7.2

Boarding

8.1

Overall

7.9

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 24 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.

  • How long is the flight from Seattle to Washington, D.C.?

    Delta and Southwest can get you from Seattle to Washington, D.C. in just under 7h 50m. Your travel time can differ by up to 49m. The distance between Seattle and Washington, D.C. is about 3735 km. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Seattle to Washington, D.C. round-trip?

    Currently priced at C$ 357, Hawaiian Airlines will fly you from Seattle to Washington, D.C. and back. In addition to Hawaiian Airlines, many other airlines offer competitively priced options for your trip. This flight start at 30% lower than the current average price 3 months from now.

  • 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: Brussels Airlines (98%), Austrian Airlines (98%), Avianca( 96%).

  • 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$ 747, our data indicates the cheapest price to be C$ 162. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), is priced around C$ 738.

  • 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, May is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of C$ 144). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of C$ 285). 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 Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Silver Spring
Hanover
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Arlington
Herndon
Manassas
Fredericksburg
Alexandria
Rockville

Browse thousands of different options on Cheapflights for your next trip

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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.
Seattle to Dulles Intl flights
Seattle to Reagan-National flights

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 16 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapestC$ 357AverageC$ 357FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights

Fly with Cheapflights

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

When you search for this flight from Seattle to Washington, D.C., Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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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