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Cheap flights from Seattle to Washington, D.C. from C$ 171

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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
29 Mar — 5 Apr1
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 July, booked 81 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 27 February 2026.

Mon 20/410:40 p.m.
SEA
-
DCA
1 stop8h 39m
Delta
Wed 22/44:39 p.m.
DCA
-
SEA
Nonstop5h 51m
Delta
Deal found 24/2C$ 286
Sun 26/410:40 p.m.
SEA
-
IAD
1 stop10h 25m
Delta
Wed 29/47:00 a.m.
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 24/2C$ 286
Tue 14/41:25 p.m.
SEA
-
IAD
1 stop7h 15m
Southwest
Tue 21/46:20 a.m.
IAD
-
SEA
2 stops14h 25m
Southwest
Deal found 25/2C$ 291
Tue 7/49:00 a.m.
SEA
-
IAD
2 stops23h 32m
Delta
Tue 21/47:00 a.m.
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 25/2C$ 295
Tue 24/36:15 a.m.
SEA
-
DCA
1 stop9h 18m
Delta
Tue 7/412:29 p.m.
DCA
-
SEA
1 stop8h 57m
Delta
Deal found 27/2C$ 297
Mon 13/43:59 p.m.
SEA
-
IAD
Nonstop4h 56m
Delta
Tue 21/47:00 a.m.
IAD
-
SEA
Nonstop5h 54m
Delta
Deal found 25/2C$ 297
Tue 31/37:25 a.m.
SEA
-
DCA
Nonstop4h 58m
Delta
Tue 7/44:40 p.m.
DCA
-
SEA
Nonstop5h 54m
Delta
Deal found 24/2C$ 298
Sat 28/33:55 p.m.
SEA
-
IAD
Nonstop4h 54m
Delta
Fri 3/47:00 a.m.
IAD
-
SEA
Nonstop6h 03m
Delta
Deal found 25/2C$ 298
Mon 16/310:58 p.m.
SEA
-
DCA
1 stop8h 22m
Delta
Wed 18/36:25 a.m.
DCA
-
SEA
1 stop7h 30m
Delta
Deal found 23/2C$ 300
Mon 20/410:40 p.m.
SEA
-
IAD
1 stop10h 25m
Delta
Wed 22/412:45 p.m.
IAD
-
SEA
1 stop10h 14m
Delta
Deal found 24/2C$ 300
Tue 7/49:00 a.m.
SEA
-
IAD
2 stops23h 32m
Delta
Wed 22/412:45 p.m.
IAD
-
SEA
1 stop10h 14m
Delta
Deal found 25/2C$ 302
Tue 31/33:55 p.m.
SEA
-
DCA
1 stop12h 24m
Delta
Wed 8/44:40 p.m.
DCA
-
SEA
Nonstop5h 54m
Delta
Deal found 25/2C$ 304

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 27 February 2026.

Round-trip from

C$ 283

One-way from

C$ 171

Popular in

June

Cheapest in

January

Average price

C$ 531

Good round-trip deal

C$ 324 or less

Good one-way deal

C$ 313 or less
Delta
  • Delta
  • 1/5-4/5
  • 1 total stop
  • 12h 14m total
  • Seattle to Washington, D.C.
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 12/4
  • Nonstop
  • 5h 00m 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).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
Search Deals
Price to beat on a one-way 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 27 February 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

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 31/3

7:25 a.m.-3:23 p.m.

Nonstop4h 58m

Washington, D.C. Reagan-National

Tue 7/4

4:40 p.m.-7:34 p.m.

Nonstop5h 54m

C$ 298

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 30/4

3:55 p.m.-12:09 a.m.

Nonstop5h 14m

Washington, D.C. Dulles Intl

Wed 20/5

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

Nonstop5h 46m

C$ 305

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/5

9:41 p.m.-5:50 a.m.

Nonstop5h 09m

Washington, D.C. Dulles Intl

Sun 24/5

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

Nonstop5h 46m

C$ 339

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/5

7:30 a.m.-3:27 p.m.

Nonstop4h 57m

Washington, D.C. Reagan-National

Wed 20/5

4:40 p.m.-7:24 p.m.

Nonstop5h 44m

C$ 346

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/5

6:00 a.m.-4:31 p.m.

1 stop7h 31m

Washington, D.C. Dulles Intl

Wed 20/5

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

Nonstop5h 44m

C$ 360

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 8/5

10:41 p.m.-6:50 a.m.

Nonstop5h 09m

Washington, D.C. Dulles Intl

Sun 10/5

6:15 a.m.-11:39 a.m.

1 stop8h 24m

C$ 393

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 29/4

7:30 a.m.-3:27 p.m.

Nonstop4h 57m

Washington, D.C. Reagan-National

Thu 21/5

4:40 p.m.-7:24 p.m.

Nonstop5h 44m

C$ 421

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 7/4

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

2 stops23h 32m

Washington, D.C. Dulles Intl

Tue 21/4

5:27 p.m.-8:54 a.m.

2 stops18h 27m

C$ 425

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 11/4

7:00 a.m.-5:28 p.m.

1 stop7h 28m

Washington, D.C. Dulles Intl

Tue 14/4

2:36 p.m.-8:57 p.m.

1 stop9h 21m

C$ 440

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 26/5

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

Nonstop5h 10m

Washington, D.C. Dulles Intl

Thu 28/5

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

Nonstop5h 44m

C$ 440

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/2

Showing 1-10 of 45 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 20 February 2026.

Booking 81 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$ 145). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of C$ 286). 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 27 February 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 58% 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 27 February 2026.

The most flights from SEA to WAS are scheduled on a Thursday (25 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (16 on average).

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington, D.C.. Reviews last updated 27 February 2026.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,242 reviews
Check prices

Overall

7.9

Entertainment

7.8

Food

7.2

Crew

8.5

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,242 reviews
Delta
7.9
Good
8,242 reviews
Check prices

Overall

7.9

Entertainment

7.8

Food

7.2

Crew

8.5

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 1 airline has 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, Alaska Airlines, and United Airlines can get you from Seattle to Washington, D.C. in just under 5h 09m. Your travel time can differ by up to 1h 14m. 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$ 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 30% 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: Brussels Airlines (98%), Austrian Airlines (98%), Avianca( 96%).

  • 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$ 426, our data indicates the cheapest price to be C$ 313. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), is priced around C$ 796.

  • 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$ 145). Flying from Seattle to Washington, D.C. in November is currently the most expensive (average of C$ 286). 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 airline flying from Seattle to Washington, D.C.

Discover the top airline 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 27 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapestC$ 359AverageC$ 359FlexibilityNo 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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