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Cheap flights from Seattle to Washington, D.C. from C$ 196

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
15 May — 22 May1
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 August, booked 83 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 15 April 2026.

Thu 4/64:05 p.m.
SEA
-
IAD
Nonstop5h 08m
Delta
Wed 10/67:00 a.m.
IAD
-
SEA
Nonstop5h 45m
Delta
Deal found 13/4C$ 337
Thu 6/811:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Sun 9/87:00 a.m.
IAD
-
SEA
1 stop10h 39m
United Airlines
Deal found 15/4C$ 346
Fri 5/67:50 p.m.
SEA
-
DCA
1 stop14h 09m
Frontier
Mon 27/77:00 a.m.
DCA
-
SEA
1 stop10h 04m
Frontier
Deal found 12/4C$ 351
Thu 3/911:10 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Mon 7/96:30 a.m.
IAD
-
SEA
1 stop8h 04m
United Airlines
Deal found 12/4C$ 351
Thu 4/611:49 p.m.
SEA
-
DCA
1 stop9h 07m
United Airlines
Tue 9/67:10 p.m.
DCA
-
SEA
1 stop7h 49m
United Airlines
Deal found 12/4C$ 365
Fri 21/82:26 p.m.
SEA
-
IAD
1 stop7h 14m
United Airlines
Fri 28/85:41 p.m.
IAD
-
SEA
1 stop8h 30m
United Airlines
Deal found 12/4C$ 365
Thu 24/98:00 a.m.
SEA
-
IAD
Nonstop4h 53m
United Airlines
Sun 27/91:00 p.m.
IAD
-
SEA
Nonstop5h 35m
United Airlines
Deal found 12/4C$ 370
Thu 30/47:12 p.m.
SEA
-
DCA
1 stop23h 47m
Frontier
Sun 3/57:59 a.m.
DCA
-
SEA
1 stop28h 28m
Frontier
Deal found 10/4C$ 372
Thu 4/63:53 p.m.
SEA
-
IAD
Nonstop5h 06m
Alaska Airlines
Sun 7/66:00 a.m.
IAD
-
SEA
Nonstop5h 46m
Alaska Airlines
Deal found 13/4C$ 372
Fri 5/65:30 a.m.
SEA
-
DCA
2 stops13h 25m
Southwest
Sun 7/61:00 p.m.
DCA
-
SEA
1 stop8h 55m
Southwest
Deal found 10/4C$ 380
Fri 12/611:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Tue 16/65:38 p.m.
IAD
-
SEA
1 stop9h 21m
United Airlines
Deal found 12/4C$ 384
Fri 24/711:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Tue 28/75:38 p.m.
IAD
-
SEA
1 stop9h 36m
United Airlines
Deal found 15/4C$ 385

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 15 April 2026.

Round-trip from

C$ 337

One-way from

C$ 196

Popular in

June

Cheapest in

January

Average price

C$ 553

Good round-trip deal

C$ 1,921 or less
Delta
  • Delta
  • 4/6-10/6
  • Nonstop
  • 10h 53m total
  • Seattle to Washington, D.C.
Search Deals
Frontier
  • Frontier
  • 27/5
  • 2 total stops
  • 28h 21m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 15 April 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

Sat 8/8

11:00 p.m.-9:32 a.m.

1 stop7h 32m

Washington, D.C. Reagan-National

Tue 11/8

1:00 p.m.-6:59 p.m.

1 stop8h 59m

C$ 403

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 5/6

7:20 a.m.-3:28 p.m.

Nonstop5h 08m

Washington, D.C. Reagan-National

Tue 9/6

4:36 p.m.-7:30 p.m.

Nonstop5h 54m

C$ 434

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 28/8

8:46 p.m.-6:14 p.m.

1 stop18h 28m

Washington, D.C. Dulles Intl

Mon 31/8

7:00 a.m.-9:40 a.m.

Nonstop5h 40m

C$ 441

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 30/9

10:10 p.m.-6:03 a.m.

Nonstop4h 53m

Washington, D.C. Dulles Intl

Sat 3/10

6:20 a.m.-11:40 a.m.

1 stop8h 20m

C$ 456

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/6

11:05 p.m.-8:45 a.m.

1 stop6h 40m

Washington, D.C. Reagan-National

Wed 10/6

4:25 p.m.-12:30 a.m.

2 stops11h 05m

C$ 461

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 28/5

4:05 p.m.-12:15 a.m.

Nonstop5h 10m

Washington, D.C. Dulles Intl

Wed 3/6

7:00 a.m.-9:44 a.m.

Nonstop5h 44m

C$ 464

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/6

7:20 a.m.-3:28 p.m.

Nonstop5h 08m

Washington, D.C. Reagan-National

Mon 27/7

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

Nonstop6h 06m

C$ 476

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 1/7

4:01 p.m.-11:59 p.m.

Nonstop4h 58m

Washington, D.C. Dulles Intl

Sat 11/7

6:14 p.m.-9:09 p.m.

Nonstop5h 55m

C$ 522

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 20/5

11:53 p.m.-11:52 a.m.

1 stop8h 59m

Washington, D.C. Dulles Intl

Mon 25/5

12:55 p.m.-3:40 p.m.

Nonstop5h 45m

C$ 523

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 4/6

6:00 a.m.-6:15 p.m.

1 stop9h 15m

Washington, D.C. Dulles Intl

Wed 10/6

7:00 a.m.-9:45 a.m.

Nonstop5h 45m

C$ 523

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/4

Showing 1-10 of 46 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.

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 10 April 2026.

Booking 74 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$ 142). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of C$ 288). 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 15 April 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 65% 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 15 April 2026.

The most flights from SEA to WAS are scheduled on a Tuesday (23 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 on average).

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

What’s the top layover airport for flights from Seattle to Washington, D.C.?

Share of one-stop round-trip flights from Seattle to Washington, D.C. chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 83% of one-stop itineraries from Seattle to Washington, D.C. on Cheapflights.

What’s the cheapest layover airport for flights from Seattle to Washington, D.C.?

Average round-trip fare for 1-stop flights from Seattle to Washington, D.C., chosen by Cheapflights users in the past 12 months, with the same layover each way.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of C$ 382.

What’s the fastest layover option from Seattle to Washington, D.C.?

Shortest average travel time for 1-stop one-way flights from Seattle to Washington, D.C., based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 12h 41m.

Which airport typically offers the quickest layover for flights from Seattle to Washington, D.C.?

Average layover duration for 1-stop one-way flights from Seattle to Washington, D.C., chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Las Vegas (LAS) offer the fastest connection on this route, with an average layover time of 3h 43m.

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 20 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.?

    Delta, United Airlines, and Southwest can get you from Seattle to Washington, D.C. in just under 4h 53m. Your travel time can differ by up to 1h 47m. The distance between Seattle and Washington, D.C. is about 3700 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$ 361, 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 31% 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%), ITA Airways (100%), Lufthansa( 100%).

  • 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$ 2,030, our data indicates the cheapest price to be C$ 1,921. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), is priced around C$ 413.

  • 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$ 142). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of C$ 288). 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 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 15 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 320AverageC$ 780FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Hawaiian AirlinesCheapestC$ 361AverageC$ 361FlexibilityNo 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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