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Cheap flights from Seattle to Washington, D.C. from C$ 242

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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
23 Aug — 30 Aug1
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 February, booked 85 days in advance, depart on a Tuesday or Thursday 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 24 July 2026.

Fri 4/911:00 p.m.
SEA
-
DCA
1 stop10h 30m
Southwest
Fri 11/94:55 p.m.
DCA
-
SEA
2 stops10h 45m
Southwest
Deal found 21/7C$ 403
Thu 3/91:57 p.m.
SEA
-
IAD
1 stop7h 47m
United Airlines
Sun 13/95:33 p.m.
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 21/7C$ 407
Tue 22/95:20 a.m.
SEA
-
DCA
2 stops10h 05m
Southwest
Tue 29/96:40 p.m.
DCA
-
SEA
2 stops16h 10m
Southwest
Deal found 20/7C$ 410
Tue 1/911:00 p.m.
SEA
-
IAD
1 stop7h 28m
United Airlines
Sun 6/91:20 p.m.
IAD
-
SEA
Nonstop5h 46m
United Airlines
Deal found 20/7C$ 414
Fri 28/86:51 p.m.
SEA
-
DCA
1 stop18h 09m
Alaska Airlines
Sun 30/88:00 a.m.
DCA
-
SEA
Nonstop5h 54m
Alaska Airlines
Deal found 24/7C$ 415
Tue 25/89:35 p.m.
SEA
-
IAD
Nonstop5h 05m
Alaska Airlines
Sat 29/87:00 a.m.
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Deal found 22/7C$ 415
Thu 27/87:06 p.m.
SEA
-
DCA
1 stop14h 45m
Multiple Airlines
Tue 1/98:00 a.m.
DCA
-
SEA
Nonstop5h 54m
Multiple Airlines
Deal found 22/7C$ 417
Wed 2/98:38 a.m.
SEA
-
IAD
Nonstop5h 06m
Alaska Airlines
Mon 7/97:00 a.m.
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Deal found 21/7C$ 417
Fri 28/87:06 p.m.
SEA
-
DCA
1 stop14h 45m
Multiple Airlines
Sun 30/88:00 a.m.
DCA
-
SEA
Nonstop5h 54m
Multiple Airlines
Deal found 22/7C$ 418
Fri 28/87:06 p.m.
SEA
-
DCA
1 stop14h 45m
Multiple Airlines
Tue 1/95:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Multiple Airlines
Deal found 21/7C$ 420
Thu 3/99:35 p.m.
SEA
-
IAD
Nonstop5h 05m
Alaska Airlines
Mon 7/97:00 a.m.
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Deal found 23/7C$ 420
Tue 25/81:46 p.m.
SEA
-
DCA
Nonstop5h 13m
Alaska Airlines
Mon 31/85:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 22/7C$ 421

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 24 July 2026.

Round-trip from

C$ 403

One-way from

C$ 242

Popular in

June

Cheapest in

January

Average price

C$ 612

Good round-trip deal

C$ 1,965 or less
Southwest
  • Southwest
  • 4/9-11/9
  • 3 total stops
  • 21h 15m total
  • Seattle to Washington, D.C.
Search Deals
Frontier
  • Frontier
  • 27/8
  • 2 total stops
  • 27h 25m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 116 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip 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 24 July 2026.
Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 26/8

1:46 p.m.-9:59 p.m.

Nonstop5h 13m

Washington, D.C. Reagan-National

Tue 1/9

5:00 p.m.-7:51 p.m.

Nonstop5h 51m

C$ 422

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 26/8

1:46 p.m.-9:59 p.m.

Nonstop5h 13m

Washington, D.C. Reagan-National

Sun 30/8

8:00 a.m.-10:54 a.m.

Nonstop5h 54m

C$ 422

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 27/8

8:00 a.m.-4:20 p.m.

Nonstop5h 20m

Washington, D.C. Reagan-National

Sun 30/8

8:00 a.m.-10:54 a.m.

Nonstop5h 54m

C$ 422

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 26/8

1:46 p.m.-9:59 p.m.

Nonstop5h 13m

Washington, D.C. Reagan-National

Mon 31/8

8:00 a.m.-10:54 a.m.

Nonstop5h 54m

C$ 422

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 9/9

7:20 a.m.-3:32 p.m.

Nonstop5h 12m

Washington, D.C. Reagan-National

Wed 23/9

4:45 p.m.-7:25 p.m.

Nonstop5h 40m

C$ 429

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 10/9

8:49 p.m.-6:14 p.m.

1 stop18h 25m

Washington, D.C. Dulles Intl

Mon 14/9

5:57 p.m.-8:44 p.m.

Nonstop5h 47m

C$ 429

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 23/9

9:35 p.m.-5:40 a.m.

Nonstop5h 05m

Washington, D.C. Dulles Intl

Sun 11/10

9:38 a.m.-12:20 p.m.

Nonstop5h 42m

C$ 438

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 27/8

7:20 a.m.-3:21 p.m.

Nonstop5h 01m

Washington, D.C. Reagan-National

Sat 29/8

4:35 p.m.-7:41 p.m.

Nonstop6h 06m

C$ 443

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 27/8

6:30 a.m.-6:55 p.m.

2 stops9h 25m

Washington, D.C. Reagan-National

Sat 5/9

3:40 p.m.-8:55 p.m.

1 stop8h 15m

C$ 450

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 9/9

6:40 a.m.-7:10 p.m.

2 stops9h 30m

Washington, D.C. Reagan-National

Wed 23/9

6:10 a.m.-11:15 a.m.

1 stop8h 05m

C$ 450

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/7

Showing 1-10 of 44 resultsSorted by cheapest first
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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.

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 C$ 463). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of C$ 739). 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 24 July 2026.

Unlike in the morning, when flights are generally more expensive, you can save up to 62% 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 24 July 2026.

The most flights from SEA to WAS are scheduled on a Wednesday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 on average).

How much does it cost to fly round-trip from Seattle to Washington, D.C.?

Airfare is below average for this route at the moment.
Seattle to Washington, D.C. flights typically cost between C$ 462 and C$ 748 in September.
The cheapest round-trip price found within the last 5 days was C$ 403 on Southwest (4 Sep-11 Sep).

How far ahead should I book a flight from Seattle to Washington, D.C.?

Booking 36 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.

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 25 outbound flights to Washington, D.C. per day. You should also have plenty of airline options to choose from since 2 airlines have 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.?

    Alaska Airlines, Delta, and United Airlines can get you from Seattle to Washington, D.C. in just under 5h 12m. Your travel time can differ by up to 2h 16m. 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$ 369, 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 36% 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: Iberia (100%), Austrian Airlines (93%), Avianca( 93%).

  • 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$ 2,076, our data indicates the cheapest price to be C$ 1,965. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), is priced around C$ 418.

  • 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, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of C$ 463). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of C$ 739). 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
Oxon Hill
Gaithersburg
Reston
Herndon
Ellicott City
Arlington
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 2 airlines flying from Seattle to Washington, D.C.

Discover the top 2 airlines 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 24 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 280AverageC$ 798FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Hawaiian AirlinesCheapestC$ 369AverageC$ 369FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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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