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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 16/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
6 Dec — 13 Dec1
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 60 days in advance, depart on a Thursday or Saturday and return on a Monday

Cheap 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 6 November 2025.

Round-trip from

C$ 346

One-way from

C$ 198

Popular in

December

Cheapest in

August

Average price

C$ 574

Good round-trip deal

C$ 458 or less

Good one-way deal

C$ 195 or less
United Airlines
  • United Airlines
  • 26/1-30/1
  • 1 total stop
  • 13h 32m total
  • Seattle to Washington, D.C.
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Delta
  • Delta
  • 16/1
  • Nonstop
  • 4h 50m total
  • Seattle to Washington, D.C.
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Highest demand for flights based on searches. 10% potential increase in price (C$ 96 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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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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Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).
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Find 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 6 November 2025.

Mon 8/1210:11 p.m.SEA - IAD
Nonstop4h 55mAlaska Airlines
Wed 10/125:37 p.m.IAD - SEA
1 stop9h 35mAlaska Airlines
Deal found 5/11C$ 350
Sun 7/127:25 a.m.SEA - DCA
Nonstop5h 02mDelta
Wed 10/126:02 a.m.DCA - SEA
1 stop7h 38mDelta
Deal found 6/11C$ 351
Tue 2/127:34 p.m.SEA - IAD
1 stop8h 56mUnited Airlines
Thu 4/125:55 p.m.IAD - SEA
Nonstop5h 59mUnited Airlines
Deal found 5/11C$ 351
Sun 21/1212:37 p.m.SEA - IAD
1 stop7h 46mUnited Airlines
Wed 31/125:55 p.m.IAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 6/11C$ 353
Tue 9/127:05 a.m.SEA - DCA
1 stop9h 55mAlaska Airlines
Fri 12/126:59 p.m.DCA - SEA
1 stop17h 53mAlaska Airlines
Deal found 6/11C$ 363
Tue 23/1211:59 p.m.SEA - IAD
1 stop8h 46mUnited Airlines
Tue 6/11:05 p.m.IAD - SEA
1 stop8h 09mUnited Airlines
Deal found 6/11C$ 363
Tue 2/1211:59 p.m.SEA - IAD
1 stop8h 24mUnited Airlines
Fri 5/126:00 a.m.IAD - SEA
1 stop8h 16mUnited Airlines
Deal found 6/11C$ 365
Mon 22/1211:15 p.m.SEA - IAD
Nonstop4h 56mUnited Airlines
Wed 31/128:26 a.m.IAD - SEA
Nonstop6h 01mUnited Airlines
Deal found 6/11C$ 367
Thu 27/118:00 a.m.SEA - IAD
Nonstop5h 07mUnited Airlines
Thu 4/125:55 p.m.IAD - SEA
Nonstop5h 59mUnited Airlines
Deal found 4/11C$ 368
Sun 21/1211:15 p.m.SEA - IAD
Nonstop4h 56mUnited Airlines
Mon 5/18:26 a.m.IAD - SEA
Nonstop6h 01mUnited Airlines
Deal found 4/11C$ 371
Wed 10/121:56 p.m.SEA - DCA
Nonstop5h 03mAlaska Airlines
Mon 15/125:00 p.m.DCA - SEA
Nonstop6h 13mAlaska Airlines
Deal found 6/11C$ 378
Thu 27/114:30 p.m.SEA - IAD
Nonstop4h 55mDelta
Thu 4/125:59 p.m.IAD - SEA
1 stop9h 00mDelta
Deal found 4/11C$ 378

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 6 November 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 - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 22/12

7:12 p.m.-6:47 a.m.

1 stop8h 35m

Washington, D.C. Dulles Intl

Thu 1/1

6:30 a.m.-12:03 p.m.

1 stop8h 33m

C$ 363

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 23/12

11:59 p.m.-11:45 a.m.

1 stop8h 46m

Washington, D.C. Dulles Intl

Tue 6/1

1:05 p.m.-6:14 p.m.

1 stop8h 09m

C$ 363

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 14/12

5:00 a.m.-3:01 p.m.

1 stop7h 01m

Washington, D.C. Dulles Intl

Sun 21/12

5:55 p.m.-8:57 p.m.

Nonstop6h 02m

C$ 379

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/12

6:35 a.m.-6:15 p.m.

1 stop8h 40m

Washington, D.C. Reagan-National

Wed 10/12

2:40 p.m.-10:55 p.m.

2 stops11h 15m

C$ 385

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 23/12

10:52 a.m.-8:59 p.m.

1 stop7h 07m

Washington, D.C. Reagan-National

Tue 6/1

1:00 p.m.-6:14 p.m.

1 stop8h 14m

C$ 392

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 5/12

8:40 a.m.-4:36 p.m.

Nonstop4h 56m

Washington, D.C. Dulles Intl

Wed 17/12

7:34 a.m.-10:35 a.m.

Nonstop6h 01m

C$ 399

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 15/12

9:25 a.m.-8:55 p.m.

1 stop8h 30m

Washington, D.C. Dulles Intl

Mon 29/12

8:26 a.m.-11:27 a.m.

Nonstop6h 01m

C$ 412

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 14/12

8:10 a.m.-4:18 p.m.

Nonstop5h 08m

Washington, D.C. Dulles Intl

Mon 22/12

5:55 p.m.-8:57 p.m.

Nonstop6h 02m

C$ 422

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 15/12

8:40 a.m.-4:36 p.m.

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 15/12

6:30 p.m.-9:30 p.m.

Nonstop6h 00m

C$ 439

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 4/1

10:55 p.m.-8:54 a.m.

1 stop6h 59m

Washington, D.C. Reagan-National

Wed 7/1

4:55 p.m.-7:54 p.m.

Nonstop5h 59m

C$ 449

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/11

Showing 1-10 of 45 results
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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 31 October 2025.

Booking 60 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$ 165). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of C$ 308). 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 6 November 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 72% on flights from Seattle to Washington, D.C. by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Seattle to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Washington, D.C.. Price data was last updated on 2 November 2025.

Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Monday afternoons when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 6 November 2025.

The most flights from SEA to WAS are scheduled on a Wednesday (30 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (20 on average).

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 86% 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$ 391.

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: 6h 50m.

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 Denver (DEN) offer the fastest connection on this route, with an average layover time of 0h 55m.

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 6 November 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
8,001 reviews
Check prices

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.2

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
8,001 reviews
Delta
7.9
Good
8,001 reviews
Check prices

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.2

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
3,116 reviews
Delta
7.9
Good
8,001 reviews
Check prices

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

7.9

Boarding

8.2

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.?

    United Airlines, Southwest, and Alaska Airlines can get you from Seattle to Washington, D.C. in just under 4h 56m. Your travel time can differ by up to 3h 44m. The distance between Seattle and Washington, D.C. is about 3700 km. This flight may include one or multiple stops.

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

    Currently priced at C$ 270, 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$ 370. These flights start at 52% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Seattle to Washington, D.C. one-way?

    For one-way options, check prices for Delta. According to our data, you can fly for as low as C$ 205. Users have also found prices from C$ 231 and C$ 233 on Southwest and United Airlines, respectively.

  • 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 (100%), Iberia( 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$ 704, our data indicates the cheapest price to be C$ 154. The most popular route (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), is priced around C$ 649.

  • 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$ 165). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of C$ 308). 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
Hanover
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Herndon
Arlington
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 6 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 270AverageC$ 500FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Hawaiian AirlinesCheapestC$ 370AverageC$ 370FlexibilityNo 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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