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Cheap flights from Seattle to Washington, D.C. from C$ 188

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 6/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
6 Jun — 13 Jun1
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 74 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 7 May 2026.

Wed 17/611:05 p.m.
SEA
-
DCA
1 stop6h 40m
Southwest
Sat 20/66:25 p.m.
DCA
-
SEA
1 stop8h 40m
Southwest
Deal found 3/5C$ 361
Thu 4/63:53 p.m.
SEA
-
IAD
Nonstop5h 06m
Alaska Airlines
Mon 8/66:00 a.m.
IAD
-
SEA
Nonstop5h 46m
Alaska Airlines
Deal found 4/5C$ 361
Thu 4/611:05 a.m.
SEA
-
DCA
1 stop9h 50m
Southwest
Wed 10/64:55 p.m.
DCA
-
SEA
2 stops10h 45m
Southwest
Deal found 4/5C$ 367
Sat 1/87:41 p.m.
SEA
-
DCA
1 stop14h 10m
Frontier
Wed 12/87:00 a.m.
DCA
-
SEA
1 stop10h 19m
Frontier
Deal found 2/5C$ 369
Sat 6/65:00 a.m.
SEA
-
DCA
2 stops10h 55m
Southwest
Tue 9/64:55 p.m.
DCA
-
SEA
2 stops10h 45m
Southwest
Deal found 5/5C$ 374
Fri 7/86:15 a.m.
SEA
-
DCA
2 stops14h 40m
Southwest
Sat 29/87:00 a.m.
DCA
-
SEA
1 stop11h 55m
Southwest
Deal found 3/5C$ 376
Wed 5/811:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Fri 21/85:41 p.m.
IAD
-
SEA
1 stop8h 30m
United Airlines
Deal found 4/5C$ 380
Fri 7/86:15 a.m.
SEA
-
DCA
2 stops14h 40m
Southwest
Sun 9/82:00 p.m.
DCA
-
SEA
1 stop12h 35m
Southwest
Deal found 6/5C$ 382
Mon 10/811:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Mon 17/812:35 p.m.
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 2/5C$ 385
Thu 24/99:32 p.m.
SEA
-
IAD
Nonstop5h 08m
Alaska Airlines
Mon 28/97:00 a.m.
IAD
-
SEA
Nonstop5h 40m
Alaska Airlines
Deal found 6/5C$ 388
Tue 14/711:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Tue 28/76:30 a.m.
IAD
-
SEA
1 stop9h 04m
United Airlines
Deal found 2/5C$ 389
Mon 18/57:50 p.m.
SEA
-
DCA
1 stop18h 09m
Frontier
Wed 20/57:00 a.m.
DCA
-
SEA
1 stop30h 06m
Frontier
Deal found 4/5C$ 391

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 7 May 2026.

Round-trip from

C$ 361

One-way from

C$ 188

Popular in

June

Cheapest in

January

Average price

C$ 517

Good round-trip deal

C$ 1,900 or less
United Airlines
  • United Airlines
  • 8/9-29/9
  • 2 total stops
  • 14h 53m total
  • Seattle to Washington, D.C.
Search Deals
Southwest
  • Southwest
  • 6/6
  • 2 total stops
  • 10h 55m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 7 May 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 - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 21/9

11:10 p.m.-7:12 a.m.

Nonstop5h 02m

Washington, D.C. Dulles Intl

Wed 23/9

12:35 p.m.-3:20 p.m.

Nonstop5h 45m

C$ 388

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 5/6

11:30 p.m.-7:34 a.m.

Nonstop5h 04m

Washington, D.C. Dulles Intl

Tue 9/6

7:37 p.m.-9:19 a.m.

1 stop16h 42m

C$ 402

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 19/8

6:00 p.m.-5:25 a.m.

1 stop8h 25m

Washington, D.C. Dulles Intl

Sun 23/8

5:18 p.m.-8:03 p.m.

Nonstop5h 45m

C$ 408

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 6/6

5:00 a.m.-6:55 p.m.

2 stops10h 55m

Washington, D.C. Reagan-National

Sun 7/6

1:00 p.m.-6:55 p.m.

1 stop8h 55m

C$ 422

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 14/8

6:21 a.m.-6:45 p.m.

1 stop9h 24m

Washington, D.C. Dulles Intl

Sun 16/8

6:03 a.m.-8:48 a.m.

Nonstop5h 45m

C$ 436
Quickest round-trip

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 25/6

10:43 p.m.-6:39 a.m.

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 29/6

6:03 a.m.-8:48 a.m.

Nonstop5h 45m

C$ 456

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 31/7

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

Nonstop5h 01m

Washington, D.C. Reagan-National

Tue 11/8

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

Nonstop6h 06m

C$ 457

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 21/7

6:21 a.m.-6:45 p.m.

1 stop9h 24m

Washington, D.C. Dulles Intl

Wed 29/7

6:03 a.m.-8:48 a.m.

Nonstop5h 45m

C$ 463

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 4/6

4:05 p.m.-12:13 a.m.

Nonstop5h 08m

Washington, D.C. Dulles Intl

Wed 10/6

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

Nonstop5h 45m

C$ 464

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 6/6

7:00 a.m.-7:02 p.m.

1 stop9h 02m

Washington, D.C. Dulles Intl

Sun 7/6

5:55 p.m.-8:46 p.m.

Nonstop5h 51m

C$ 509

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 47 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.?

Booking 76 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, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of C$ 135). Flying from Seattle to Washington, D.C. in March is currently the most expensive (average of C$ 1,646). 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 7 May 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 7 May 2026.

The most flights from SEA to WAS are scheduled on a Monday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 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$ 378.

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.?

    Alaska Airlines, United Airlines, and Delta can get you from Seattle to Washington, D.C. in just under 5h 01m. Your travel time can differ by up to 3h 24m. 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 32% 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: Copa Airlines (100%), Iberia (100%), ITA Airways( 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$ 2,007, our data indicates the cheapest price to be C$ 1,900. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), is priced around C$ 461.

  • 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$ 135). Flying from Seattle to Washington, D.C. in March is currently the most expensive (average of C$ 1,646). 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 7 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 271AverageC$ 771FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
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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