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Washington, D.C.

$114+ Cheap flights from Seattle (SEA) to Washington, D.C. (WAS)

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — WAS
Jul 16 — Jul 231
Thu 7/16
Thu 7/23
1 adult, Economy
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Find cheap flights from Seattle to Washington, D.C. with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in January or February, booked 85 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Seattle to Washington, D.C.

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 June 16, 2026.

This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/297:26 am
SEA
-
BWI
1 stop8h 58m
American Airlines
Mon 8/104:25 pm
BWI
-
SEA
1 stop8h 34m
American Airlines
Deal found 6/15$227
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2611:00 pm
SEA
-
BWI
1 stop8h 09m
United Airlines
Sat 11/146:15 am
BWI
-
SEA
1 stop8h 57m
United Airlines
Deal found 6/14$258
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:10 am
SEA
-
BWI
1 stop7h 04m
American Airlines
Tue 8/256:00 am
BWI
-
SEA
1 stop8h 15m
American Airlines
Deal found 6/11$263
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/307:10 am
SEA
-
BWI
1 stop7h 38m
American Airlines
Tue 8/47:17 pm
BWI
-
SEA
1 stop8h 40m
American Airlines
Deal found 6/15$273
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/41:53 pm
SEA
-
BWI
1 stop7h 37m
American Airlines
Mon 11/97:07 pm
BWI
-
SEA
1 stop8h 51m
American Airlines
Deal found 6/12$295
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:10 am
SEA
-
DCA
1 stop8h 03m
American Airlines
Tue 7/215:24 pm
DCA
-
SEA
1 stop8h 32m
American Airlines
Deal found 6/15$295
This United Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/611:20 pm
SEA
-
IAD
Nonstop5h 02m
United Airlines
Mon 8/105:55 pm
IAD
-
SEA
Nonstop5h 51m
United Airlines
Deal found 6/16$295
This Flybillet deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flybillet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/64:01 pm
SEA
-
IAD
Nonstop4h 58m
Alaska Airlines
Sat 8/156:14 pm
IAD
-
SEA
Nonstop5h 55m
Alaska Airlines
Deal found 6/13$296
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1911:00 pm
SEA
-
IAD
1 stop7h 23m
United Airlines
Tue 8/2512:50 pm
IAD
-
SEA
1 stop7h 52m
United Airlines
Deal found 6/15$297
This Booking.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:21 am
SEA
-
DCA
1 stop11h 39m
Multiple Airlines
Mon 7/277:00 am
DCA
-
SEA
1 stop29h 17m
Multiple Airlines
Deal found 6/12$298
This Expedia deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/158:13 pm
SEA
-
IAD
1 stop9h 07m
Frontier
Wed 7/299:50 am
IAD
-
SEA
1 stop27h 49m
Frontier
Deal found 6/15$298
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:00 pm
SEA
-
BWI
1 stop8h 39m
United Airlines
Tue 9/2210:25 am
BWI
-
SEA
1 stop8h 42m
United Airlines
Deal found 6/15$299

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 June 16, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$227
(American Airlines)

One-way from

$114
(American Airlines)

Popular in

June

Cheapest in

January

Average price

$537

Good round-trip deal

$379 or less

Good one-way deal

$226 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Washington, D.C. (WAS) flights.
Search Deals
From Seattle/Tacoma Intl to Washington, D.C. (WAS)
Search Deals
One-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS)
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 2,558,603 searches. Data last updated June 16, 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

Wed 8/19

6:40 am-7:10 pm

2 stops9h 30m

Washington, D.C. Reagan-National

Tue 8/25

6:40 pm-11:35 pm

1 stop7h 55m

$320

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 8/19

11:04 pm-7:07 am

Nonstop5h 03m

Washington, D.C. Dulles Intl

Tue 8/25

12:57 pm-3:43 pm

Nonstop5h 46m

$320

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 7/29

11:20 pm-7:22 am

Nonstop5h 02m

Washington, D.C. Dulles Intl

Mon 8/10

5:41 pm-11:10 pm

1 stop8h 29m

$330

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 8/10

11:20 pm-7:22 am

Nonstop5h 02m

Washington, D.C. Dulles Intl

Sat 8/15

5:33 pm-8:18 pm

Nonstop5h 45m

$334

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 8/19

10:30 pm-6:30 am

Nonstop5h 00m

Baltimore/Washington

Wed 8/26

3:15 pm-9:15 pm

1 stop9h 00m

$339

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/18

5:15 am-2:50 pm

1 stop6h 35m

Washington, D.C. Reagan-National

Mon 9/21

4:05 pm-10:55 pm

2 stops9h 50m

$340

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 8/19

7:40 am-9:00 pm

1 stop10h 20m

Washington, D.C. Reagan-National

Tue 8/25

8:00 am-10:54 am

Nonstop5h 54m

$352

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 9/10

8:49 pm-6:14 pm

1 stop18h 25m

Washington, D.C. Dulles Intl

Mon 9/14

7:47 pm-9:20 am

1 stop16h 33m

$355

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 8/21

6:10 pm-5:25 am

1 stop8h 15m

Washington, D.C. Dulles Intl

Tue 8/25

12:57 pm-3:43 pm

Nonstop5h 46m

$375

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 10/16

9:05 pm-5:53 pm

1 stop17h 48m

Washington, D.C. Dulles Intl

Sun 10/18

7:24 pm-9:28 am

1 stop17h 04m

$377

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 60 resultsSorted by cheapest first
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Compare providers for flights from Seattle to Washington, D.C.

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Washington, D.C. in June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapTicketsDealPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Washington, D.C. flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

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 $99). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of $1,526). 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 June 16, 2026.

When flying from Seattle to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 28% versus a flight at noon.

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 June 16, 2026.

The most flights from SEA to WAS are scheduled on a Monday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 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 1-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 63% of 1-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 $356.

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 San Diego (SAN) have the shortest average one-way travel time for 1-stop routes: 9h 27m.

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 4h 34m.

How far ahead should I book a flight from Seattle to Washington, D.C.?

The price you pay for your flight from Seattle to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 26 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 June 13, 2026.

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

The best insider tips for Seattle to Washington, D.C. flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Washington, D.C. trip
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Emily Zemler

Emily Zemler

Expert on DCA

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

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 June 16, 2026.
Read reviews from past customers who have flown Alaska Airlines,Delta, andUnited Airlines from Seattle to Washington, D.C.. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,522 reviews

Boarding

8.1

Food

7.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Alaska Airlines
7.9
Good
12,522 reviews
Alaska Airlines
7.9
Good
12,522 reviews

Boarding

8.1

Food

7.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Delta
7.9
Good
8,405 reviews
Alaska Airlines
7.9
Good
12,522 reviews

Boarding

8.1

Food

7.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
United Airlines
7.4
Good
9,842 reviews
Alaska Airlines
7.9
Good
12,522 reviews

Boarding

8.1

Food

7.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
American Airlines
7.1
Good
11,666 reviews
Alaska Airlines
7.9
Good
12,522 reviews

Boarding

8.1

Food

7.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Frontier
5.6
Fair
2,883 reviews
Alaska Airlines
7.9
Good
12,522 reviews

Boarding

8.1

Food

7.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

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), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Washington, D.C.. 7 airlines have flights from Seattle/Tacoma Intl to Washington, D.C. on a regular basis. Booking flights from Seattle/Tacoma Intl to Washington, D.C. should not be difficult; the airport handles an average of 22 outbound flights to Washington, D.C. per day.

  • How long is the flight from Seattle to Washington, D.C.?

    A quick flight from Seattle to Washington, D.C. can take about 5h 03m. Southwest provides one of the quickest options available for as low as $320. The distance between Seattle and Washington, D.C. is about 2299 mi. This flight may include one or multiple stops.

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

    Our cheapest airline available from Seattle to Washington, D.C. is Frontier. Our recent data shows that you can find tickets from as low as $126 on this airline. Additional options worth looking into are Hawaiian Airlines and Delta, starting at $138 and $147 round-trip. Frontier is currently priced 69% below the average price you’ll pay for this route.

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

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $109. However, be on the lookout for offers from Delta and Frontier, as they are both options that can get you from Seattle to Washington, D.C. for a low price.

  • What are the most popular routes from Seattle to Washington, D.C.?

    The most popular flight routes from Seattle to Washington, D.C. are Seattle/Tacoma Intl - Washington, D.C. Dulles Intl, Seattle/Tacoma Intl - Washington, D.C. Reagan-National and Seattle/Tacoma Intl - Baltimore/Washington.

  • What are the most reliable airlines from Seattle to Washington, D.C.?

    No one likes to see their flight delayed. When booking a flight from Seattle to Washington, D.C. consider choosing Alaska Airlines (92%), Avianca (90%) or Japan Airlines (88%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Seattle to Washington, D.C.?

    While on average a flight from Seattle to Washington, D.C. is generally $1,151, our data shows the cheapest flight currently is $147. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $255 for that flight.

  • 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 $99). Flying from Seattle to Washington, D.C. in April is currently the most expensive (average of $1,526). 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

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Arlington
Tysons
Owings Mills
Springfield
Lanham
Reston
Herndon
Rockville
Hyattsville
Manassas
Fredericksburg
Laurel
Hanover
Falls Church
Waldorf
Silver Spring
Largo
Clinton
Hunt Valley

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.

Top 7 airlines flying from Seattle to Washington, D.C.

Discover the top 7 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 2,558,603 searches. Data last updated June 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$103Average$346FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$126Average$297FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$128Average$339FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$178Average$437FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$199Average$467FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$199Average$436FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$219Average$424FlexibilityNo cancel feeOn-time69%

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