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Cheap flights from Seattle to Washington, D.C. from C$ 204

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 7/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
13 Nov — 20 Nov1
1 adult
1 adult, Economy

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 14 October 2025.

Round-trip from

C$ 339

One-way from

C$ 204

Popular in

December

Cheapest in

August

Average price

C$ 559
Delta
  • Delta
  • 3/11-11/11
  • Nonstop
  • 10h 56m total
  • Seattle to Washington, D.C.
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Alaska Airlines
  • Alaska Airlines
  • 7/11
  • 1 total stop
  • 17h 26m total
  • Seattle to Washington, D.C.
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Highest demand for flights based on searches. 12% potential increase in price (C$ 116 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 24 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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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 14 October 2025.

Mon 3/114:48 p.m.SEA - IAD
Nonstop4h 52mDelta
Tue 11/117:15 a.m.IAD - SEA
Nonstop6h 04mDelta
Deal found 12/10C$ 339
Wed 3/127:20 a.m.SEA - DCA
1 stop10h 42mHawaiian Airlines
Wed 10/128:59 a.m.DCA - SEA
1 stop11h 28mHawaiian Airlines
Deal found 14/10C$ 347
Wed 19/111:52 p.m.SEA - DCA
Nonstop5h 07mAlaska Airlines
Thu 27/118:00 a.m.DCA - SEA
Nonstop6h 05mAlaska Airlines
Deal found 14/10C$ 348
Wed 12/114:59 p.m.SEA - IAD
Nonstop4h 55mDelta
Mon 24/117:15 a.m.IAD - SEA
Nonstop6h 04mDelta
Deal found 13/10C$ 348
Thu 13/117:25 a.m.SEA - DCA
Nonstop5h 00mDelta
Sun 16/116:06 a.m.DCA - SEA
1 stop7h 40mDelta
Deal found 12/10C$ 350
Sat 8/1111:15 a.m.SEA - IAD
1 stop9h 18mDelta
Mon 10/117:15 a.m.IAD - SEA
Nonstop6h 04mDelta
Deal found 14/10C$ 350
Thu 25/128:00 a.m.SEA - DCA
Nonstop5h 05mAlaska Airlines
Mon 5/15:00 p.m.DCA - SEA
Nonstop6h 00mAlaska Airlines
Deal found 13/10C$ 361
Mon 29/1210:14 p.m.SEA - IAD
Nonstop4h 59mAlaska Airlines
Mon 5/17:33 a.m.IAD - SEA
Nonstop5h 47mAlaska Airlines
Deal found 13/10C$ 361
Mon 10/115:20 a.m.SEA - DCA
1 stop7h 40mAlaska Airlines
Tue 18/115:53 p.m.DCA - SEA
1 stop8h 39mAlaska Airlines
Deal found 13/10C$ 362
Tue 11/1111:10 p.m.SEA - DCA
1 stop6h 29mDelta
Mon 17/119:34 a.m.DCA - SEA
1 stop8h 11mDelta
Deal found 14/10C$ 364
Tue 4/116:00 a.m.SEA - IAD
1 stop7h 57mDelta
Sat 8/115:52 p.m.IAD - SEA
1 stop9h 02mDelta
Deal found 14/10C$ 364
Mon 3/1111:10 p.m.SEA - DCA
1 stop9h 21mDelta
Tue 11/116:59 p.m.DCA - SEA
1 stop8h 02mDelta
Deal found 12/10C$ 367

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 14 October 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 3/11

4:48 p.m.-12:40 a.m.

Nonstop4h 52m

Washington, D.C. Dulles Intl

Tue 11/11

7:15 a.m.-10:19 a.m.

Nonstop6h 04m

C$ 339

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 31/12

9:34 a.m.-5:43 p.m.

Nonstop5h 09m

Washington, D.C. Dulles Intl

Tue 6/1

6:43 p.m.-9:32 p.m.

Nonstop5h 49m

C$ 348

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 12/11

4:59 p.m.-12:54 a.m.

Nonstop4h 55m

Washington, D.C. Dulles Intl

Mon 24/11

7:15 a.m.-10:19 a.m.

Nonstop6h 04m

C$ 348

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 28/12

10:14 p.m.-6:13 a.m.

Nonstop4h 59m

Washington, D.C. Dulles Intl

Tue 6/1

6:43 p.m.-9:32 p.m.

Nonstop5h 49m

C$ 348

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 4/11

8:00 a.m.-4:07 p.m.

Nonstop5h 07m

Washington, D.C. Dulles Intl

Mon 10/11

6:30 a.m.-1:38 p.m.

1 stop10h 08m

C$ 350

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 12/11

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Mon 17/11

6:59 p.m.-12:01 a.m.

1 stop8h 02m

C$ 350

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 12/11

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Sun 16/11

6:06 a.m.-10:46 a.m.

1 stop7h 40m

C$ 350

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 9/11

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Wed 19/11

12:36 p.m.-6:40 p.m.

1 stop9h 04m

C$ 350

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 11/11

11:55 p.m.-11:12 a.m.

1 stop8h 17m

Washington, D.C. Reagan-National

Mon 17/11

4:56 p.m.-7:59 p.m.

Nonstop6h 03m

C$ 350

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 14/11

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Thu 20/11

6:59 a.m.-12:43 p.m.

1 stop8h 44m

C$ 350

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 44 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 10 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$ 164). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of C$ 303). 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 14 October 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 12 October 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 14 October 2025.

The most flights from SEA to WAS are scheduled on a Monday (38 on average). You will have fewer flight options on Wednesday, 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$ 390.

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 14 October 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
8.0
Very good
7,972 reviews
Check prices

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
8.0
Very good
7,972 reviews
Delta
8.0
Very good
7,972 reviews
Check prices

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Frontier
5.8
Fair
3,136 reviews
Delta
8.0
Very good
7,972 reviews
Check prices

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 31 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, Alaska Airlines, and United Airlines can get you from Seattle to Washington, D.C. in just under 4h 52m. 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 are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?

    Currently priced at C$ 268, 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$ 368. 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: STARLUX Airlines (100%), Austrian Airlines (93%), Brussels Airlines( 93%).

  • 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$ 164). Flying from Seattle to Washington, D.C. in December is currently the most expensive (average of C$ 303). 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
Reston
Fairfax
Ellicott City
Oxon Hill
Gaithersburg
Herndon
Arlington
Alexandria
Manassas
Fredericksburg
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 14 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 268AverageC$ 491FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Hawaiian AirlinesCheapestC$ 368AverageC$ 368FlexibilityNo 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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