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Cheap flights from Seattle to Washington, D.C. from C$ 198

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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
24 Jun — 1 Jul1
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 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 25 May 2026.

Thu 27/811:00 p.m.
SEA
-
IAD
1 stop7h 23m
United Airlines
Mon 31/85:15 p.m.
IAD
-
SEA
1 stop8h 30m
United Airlines
Deal found 22/5C$ 413
Wed 9/91:46 p.m.
SEA
-
DCA
Nonstop5h 13m
Alaska Airlines
Tue 15/95:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 25/5C$ 414
Thu 20/811:04 p.m.
SEA
-
IAD
Nonstop5h 03m
United Airlines
Sun 23/85:26 p.m.
IAD
-
SEA
1 stop8h 38m
United Airlines
Deal found 20/5C$ 417
Thu 3/97:23 a.m.
SEA
-
DCA
Nonstop5h 17m
Delta
Mon 7/94:40 p.m.
DCA
-
SEA
Nonstop6h 06m
Delta
Deal found 21/5C$ 421
Thu 3/98:51 p.m.
SEA
-
IAD
1 stop18h 23m
Alaska Airlines
Mon 7/97:00 a.m.
IAD
-
SEA
Nonstop5h 37m
Alaska Airlines
Deal found 21/5C$ 421
Fri 25/92:45 p.m.
SEA
-
IAD
Nonstop5h 04m
Delta
Tue 6/107:05 a.m.
IAD
-
SEA
Nonstop6h 00m
Delta
Deal found 24/5C$ 423
Wed 2/91:57 p.m.
SEA
-
IAD
1 stop7h 47m
United Airlines
Mon 7/96:30 a.m.
IAD
-
SEA
1 stop8h 14m
United Airlines
Deal found 24/5C$ 424
Thu 27/88:48 a.m.
SEA
-
DCA
1 stop9h 12m
Alaska Airlines
Mon 31/85:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 22/5C$ 428
Fri 4/92:34 p.m.
SEA
-
IAD
1 stop6h 58m
United Airlines
Fri 11/98:35 a.m.
IAD
-
SEA
1 stop8h 53m
United Airlines
Deal found 22/5C$ 428
Thu 20/811:04 p.m.
SEA
-
IAD
Nonstop5h 03m
United Airlines
Wed 26/85:33 p.m.
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 21/5C$ 434
Mon 13/711:05 p.m.
SEA
-
DCA
1 stop9h 10m
Southwest
Tue 21/76:55 p.m.
DCA
-
SEA
1 stop8h 30m
Southwest
Deal found 22/5C$ 435
Thu 27/88:51 p.m.
SEA
-
IAD
1 stop18h 23m
Alaska Airlines
Mon 31/87:35 p.m.
IAD
-
SEA
1 stop16h 45m
Alaska Airlines
Deal found 25/5C$ 435

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 25 May 2026.

Round-trip from

C$ 413

One-way from

C$ 198

Popular in

June

Cheapest in

January

Average price

C$ 571

Good round-trip deal

C$ 1,928 or less
United Airlines
  • United Airlines
  • 27/8-31/8
  • 2 total stops
  • 15h 53m total
  • Seattle to Washington, D.C.
Search Deals
Southwest
  • Southwest
  • 4/9
  • 1 total stop
  • 10h 30m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 14 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 25 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

Fri 25/9

8:51 p.m.-6:14 p.m.

1 stop18h 23m

Washington, D.C. Dulles Intl

Sun 27/9

7:00 a.m.-9:37 a.m.

Nonstop5h 37m

C$ 421

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 31/7

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

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 3/8

7:53 p.m.-9:19 a.m.

1 stop16h 26m

C$ 449
Quickest round-trip

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 10/7

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

Nonstop4h 58m

Washington, D.C. Dulles Intl

Sun 12/7

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

Nonstop5h 45m

C$ 463

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 28/8

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

1 stop10h 20m

Washington, D.C. Reagan-National

Tue 1/9

10:59 a.m.-7:52 p.m.

1 stop11h 53m

C$ 470

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 5/8

11:00 p.m.-3:50 p.m.

1 stop13h 50m

Washington, D.C. Reagan-National

Thu 6/8

6:40 p.m.-11:30 p.m.

1 stop7h 50m

C$ 492

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 16/10

9:05 p.m.-5:53 p.m.

1 stop17h 48m

Washington, D.C. Dulles Intl

Sun 18/10

9:35 a.m.-12:20 p.m.

Nonstop5h 45m

C$ 507

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 10/7

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

Nonstop4h 58m

Washington, D.C. Dulles Intl

Mon 13/7

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

Nonstop5h 55m

C$ 525

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 22/8

5:10 a.m.-4:41 p.m.

1 stop8h 31m

Washington, D.C. Dulles Intl

Tue 25/8

7:10 a.m.-9:55 a.m.

Nonstop5h 45m

C$ 532

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 3/7

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

Nonstop4h 58m

Washington, D.C. Dulles Intl

Mon 6/7

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

Nonstop5h 55m

C$ 533

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 3/9

8:48 a.m.-9:00 p.m.

1 stop9h 12m

Washington, D.C. Reagan-National

Sun 6/9

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

Nonstop5h 54m

C$ 546

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/5

Showing 1-10 of 41 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$ 137). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of C$ 2,240). 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 25 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 25 May 2026.

The most flights from SEA to WAS are scheduled on a Friday (28 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (22 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$ 383.

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.

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

Booking 26 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, Southwest, and Delta can get you from Seattle to Washington, D.C. in just under 5h 01m. Your travel time can differ by up to 13h 22m. 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$ 362, 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 33% 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%), Ethiopian Air( 97%).

  • 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$ 2,037, our data indicates the cheapest price to be C$ 1,928. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), is priced around C$ 623.

  • 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$ 137). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of C$ 2,240). 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 Reagan-National flights
Seattle to Dulles Intl 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 25 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 275AverageC$ 783FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Hawaiian AirlinesCheapestC$ 362AverageC$ 362FlexibilityNo 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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