Find flights
Deals
When to book
Airlines
FAQs

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 14/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
25 Jan — 1 Feb1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in August or July, booked 83 days in advance, depart on a Thursday or Saturday 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 26 December 2025.

Tue 30/123:30 p.m.SEA - IAD
Nonstop4h 57mDelta
Fri 30/17:30 a.m.IAD - SEA
Nonstop5h 59mDelta
Deal found 25/12C$ 825
Tue 30/1210:14 p.m.SEA - IAD
Nonstop4h 59mAlaska Airlines
Fri 30/15:26 p.m.IAD - SEA
1 stop19h 02mAlaska Airlines
Deal found 25/12C$ 838
Wed 31/127:00 a.m.SEA - IAD
1 stop14h 15mUnited Airlines
Tue 6/18:25 a.m.IAD - SEA
2 stops12h 49mUnited Airlines
Deal found 23/12C$ 845
Tue 30/1210:52 a.m.SEA - IAD
2 stops21h 56mUnited Airlines
Fri 30/15:17 p.m.IAD - SEA
1 stop8h 26mUnited Airlines
Deal found 25/12C$ 870
Tue 30/123:30 p.m.SEA - IAD
Nonstop4h 57mDelta
Tue 6/17:30 a.m.IAD - SEA
Nonstop5h 59mDelta
Deal found 23/12C$ 892
Wed 31/128:00 a.m.SEA - DCA
Nonstop5h 05mAlaska Airlines
Sun 11/15:09 p.m.DCA - SEA
1 stop8h 24mAlaska Airlines
Deal found 24/12C$ 933
Wed 31/121:55 p.m.SEA - DCA
Nonstop5h 04mAlaska Airlines
Wed 7/15:01 p.m.DCA - SEA
Nonstop6h 06mAlaska Airlines
Deal found 24/12C$ 946
Wed 31/129:34 a.m.SEA - IAD
Nonstop5h 09mAlaska Airlines
Thu 8/16:04 p.m.IAD - SEA
Nonstop6h 04mAlaska Airlines
Deal found 24/12C$ 946
Tue 30/1211:59 p.m.SEA - IAD
2 stops13h 31mUnited Airlines
Tue 6/18:25 a.m.IAD - SEA
2 stops12h 49mUnited Airlines
Deal found 23/12C$ 952
Sat 27/126:00 a.m.SEA - DCA
1 stop11h 39mAlaska Airlines
Sat 10/18:00 a.m.DCA - SEA
Nonstop6h 09mAlaska Airlines
Deal found 25/12C$ 1,050
Thu 25/126:35 a.m.SEA - DCA
1 stop8h 40mSouthwest
Sat 10/12:15 p.m.DCA - SEA
2 stops9h 50mSouthwest
Deal found 24/12C$ 1,098
Sun 28/128:55 p.m.SEA - DCA
2 stops15h 00mSouthwest
Thu 8/13:25 p.m.DCA - SEA
2 stops10h 05mSouthwest
Deal found 24/12C$ 1,113

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 26 December 2025.

Round-trip from

C$ 286

One-way from

C$ 171

Popular in

December

Cheapest in

August

Average price

C$ 658
Delta
  • Delta
  • 15/1-20/1
  • 1 total stop
  • 13h 34m total
  • Seattle to Washington, D.C.
Search Deals
United Airlines
  • United Airlines
  • 24/2
  • 1 total stop
  • 7h 38m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 108 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 26 December 2025.
Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Seattle

Fly to

Washington, D.C.

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 21/1

6:05 a.m.-5:04 p.m.

1 stop7h 59m

Washington, D.C. Reagan-National

Mon 26/1

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 22/1

12:00 p.m.-10:00 p.m.

1 stop7h 00m

Washington, D.C. Reagan-National

Sun 25/1

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 25/1

11:10 p.m.-8:53 a.m.

1 stop6h 43m

Washington, D.C. Reagan-National

Wed 11/2

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 14/2

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

1 stop9h 00m

Washington, D.C. Reagan-National

Thu 19/2

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 15/1

5:25 a.m.-4:00 p.m.

1 stop7h 35m

Washington, D.C. Reagan-National

Mon 26/1

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 14/2

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

1 stop9h 00m

Washington, D.C. Reagan-National

Tue 17/2

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 6/2

6:05 a.m.-6:04 p.m.

1 stop8h 59m

Washington, D.C. Reagan-National

Sun 8/2

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 15/1

5:25 a.m.-4:00 p.m.

1 stop7h 35m

Washington, D.C. Reagan-National

Sun 25/1

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 18/3

11:50 a.m.-11:35 p.m.

1 stop8h 45m

Washington, D.C. Reagan-National

Tue 24/3

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

Nonstop5h 54m

C$ 286

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 22/1

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Thu 29/1

9:54 a.m.-2:21 p.m.

1 stop7h 27m

C$ 286

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/12

Showing 1-10 of 45 results
1
2
3
...
5

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 19 December 2025.

Booking 27 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$ 157). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of C$ 293). 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 26 December 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 68% 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 26 December 2025.

The most flights from SEA to WAS are scheduled on a Friday (32 on average). You will have fewer flight options on Saturday, 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.?

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 26 December 2025.
Read through reviews of airlines operating flights from Seattle to Washington, D.C., such as Delta and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,018 reviews
Check prices

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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
8,018 reviews
Delta
7.9
Good
8,018 reviews
Check prices

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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.
Frontier
5.8
Fair
3,071 reviews
Delta
7.9
Good
8,018 reviews
Check prices

Entertainment

7.9

Overall

7.9

Food

7.3

Boarding

8.1

Comfort

7.9

Crew

8.5

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 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.?

    Delta can get you from Seattle to Washington, D.C. in just under 7h 59m. Your travel time can differ by up to . The distance between Seattle and Washington, D.C. is about 3735 km.

  • What are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?

    Currently priced at C$ 261, Alaska Airlines will fly you from Seattle to Washington, D.C. and back. In addition to Alaska Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Hawaiian Airlines for as low as C$ 359. These flights start at 52% 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%), Avianca (97%), United Airlines( 97%).

  • 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$ 157). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of C$ 293). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 26 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 261AverageC$ 386FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.