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Cheap flights from Seattle to Washington, D.C. from C$ 185

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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
24 May — 31 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 24 April 2026.

Tue 15/93:55 p.m.
SEA
-
IAD
Nonstop5h 00m
Delta
Wed 23/97:10 a.m.
IAD
-
SEA
Nonstop5h 53m
Delta
Deal found 20/4C$ 335
Sat 23/511:30 p.m.
SEA
-
IAD
Nonstop5h 04m
Alaska Airlines
Sat 30/56:00 a.m.
IAD
-
SEA
Nonstop5h 46m
Alaska Airlines
Deal found 21/4C$ 338
Thu 11/611:52 p.m.
SEA
-
DCA
1 stop7h 07m
United Airlines
Tue 29/94:38 p.m.
DCA
-
SEA
1 stop9h 02m
United Airlines
Deal found 21/4C$ 343
Thu 11/610:40 p.m.
SEA
-
IAD
1 stop7h 44m
United Airlines
Tue 29/96:30 a.m.
IAD
-
SEA
1 stop8h 14m
United Airlines
Deal found 21/4C$ 343
Wed 3/611:45 p.m.
SEA
-
DCA
1 stop8h 30m
Southwest
Sat 6/66:25 p.m.
DCA
-
SEA
1 stop8h 40m
Southwest
Deal found 23/4C$ 347
Tue 15/911:10 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Thu 24/93:30 p.m.
IAD
-
SEA
1 stop9h 59m
United Airlines
Deal found 20/4C$ 349
Wed 15/711:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Sat 18/75:38 p.m.
IAD
-
SEA
1 stop9h 36m
United Airlines
Deal found 21/4C$ 352
Thu 11/611:05 a.m.
SEA
-
DCA
1 stop9h 50m
Southwest
Tue 29/910:40 a.m.
DCA
-
SEA
2 stops10h 30m
Southwest
Deal found 21/4C$ 354
Thu 13/85:15 a.m.
SEA
-
DCA
1 stop6h 35m
Southwest
Wed 19/84:35 p.m.
DCA
-
SEA
1 stop10h 00m
Southwest
Deal found 24/4C$ 363
Thu 10/93:53 p.m.
SEA
-
IAD
Nonstop5h 06m
Alaska Airlines
Mon 14/97:00 a.m.
IAD
-
SEA
Nonstop5h 40m
Alaska Airlines
Deal found 20/4C$ 363
Wed 27/511:45 p.m.
SEA
-
DCA
1 stop8h 25m
Southwest
Sat 6/66:25 p.m.
DCA
-
SEA
1 stop8h 40m
Southwest
Deal found 20/4C$ 367
Wed 5/811:00 p.m.
SEA
-
DCA
1 stop10h 20m
Southwest
Mon 10/86:40 p.m.
DCA
-
SEA
1 stop7h 50m
Southwest
Deal found 22/4C$ 369

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 April 2026.

Round-trip from

C$ 335

One-way from

C$ 185

Popular in

June

Cheapest in

January

Average price

C$ 555

Good round-trip deal

C$ 1,909 or less
Delta
  • Delta
  • 15/9-23/9
  • Nonstop
  • 10h 53m total
  • Seattle to Washington, D.C.
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Southwest
  • Southwest
  • 8/9
  • 1 total stop
  • 10h 05m 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).
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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
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
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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 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 22/8

11:56 p.m.-11:25 a.m.

1 stop8h 29m

Washington, D.C. Reagan-National

Sat 29/8

4:07 p.m.-9:11 p.m.

1 stop8h 04m

C$ 363

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 23/5

3:53 p.m.-11:59 p.m.

Nonstop5h 06m

Washington, D.C. Dulles Intl

Tue 26/5

6:00 a.m.-8:46 a.m.

Nonstop5h 46m

C$ 379

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 4/9

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

Nonstop5h 02m

Washington, D.C. Dulles Intl

Tue 8/9

5:41 p.m.-11:11 p.m.

1 stop8h 30m

C$ 390

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

Mon 8/6

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

Nonstop5h 54m

C$ 393

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 24/9

3:53 p.m.-11:59 p.m.

Nonstop5h 06m

Washington, D.C. Dulles Intl

Mon 28/9

7:29 p.m.-9:23 a.m.

1 stop16h 54m

C$ 424

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 20/5

7:20 a.m.-3:30 p.m.

Nonstop5h 10m

Washington, D.C. Reagan-National

Tue 2/6

4:40 p.m.-7:22 p.m.

Nonstop5h 42m

C$ 447

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 20/5

3:53 p.m.-11:59 p.m.

Nonstop5h 06m

Washington, D.C. Dulles Intl

Tue 26/5

6:00 a.m.-8:46 a.m.

Nonstop5h 46m

C$ 461

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 29/5

8:22 a.m.-4:35 p.m.

Nonstop5h 13m

Washington, D.C. Dulles Intl

Mon 1/6

5:35 p.m.-8:29 p.m.

Nonstop5h 54m

C$ 461

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 26/5

3:53 p.m.-11:59 p.m.

Nonstop5h 06m

Washington, D.C. Dulles Intl

Sat 30/5

6:00 a.m.-8:46 a.m.

Nonstop5h 46m

C$ 461

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 18/6

4:20 p.m.-12:25 a.m.

Nonstop5h 05m

Washington, D.C. Dulles Intl

Mon 22/6

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

Nonstop5h 45m

C$ 466

Flights are sorted by cheapest round-trip flights first.

Deals found on 21/4

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.

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$ 1,654). 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 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 24 April 2026.

The most flights from SEA to WAS are scheduled on a Monday (22 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (15 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$ 380.

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 19 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 02m. Your travel time will be generally consistent. The distance between Seattle and Washington, D.C. is about 3700 km. All flights are typically direct.

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

    Currently priced at C$ 359, 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: 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$ 2,017, our data indicates the cheapest price to be C$ 1,909. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), is priced around C$ 564.

  • 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$ 1,654). 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 24 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 272AverageC$ 775FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Hawaiian AirlinesCheapestC$ 359AverageC$ 359FlexibilityNo 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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