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$120+ Cheap flights from Reagan-National (DCA) to Seattle (SEA)

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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Reagan-National to Seattle/Tacoma Intl are usually found in September or February, booked 74 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from Reagan-National to Seattle

Cheapest flights from Reagan-National to Seattle
Explore the most affordable flight options available from Reagan-National to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This CheapOair deal was found by Cheapflights users on 1/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:00 pm
DCA
-
SEA
1 stop18h 27m
Frontier
Wed 4/296:57 pm
SEA
-
DCA
1 stop15h 03m
Frontier
Deal found 1/24$191
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/52:00 pm
DCA
-
SEA
1 stop24h 19m
Frontier
Mon 3/912:24 pm
SEA
-
DCA
1 stop21h 38m
Frontier
Deal found 1/26$194
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/272:00 pm
DCA
-
SEA
1 stop25h 01m
Frontier
Mon 3/29:14 pm
SEA
-
DCA
2 stops21h 45m
Frontier
Deal found 1/25$196
This CheapOair deal was found by Cheapflights users on 1/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:00 am
DCA
-
SEA
1 stop31h 01m
Frontier
Fri 2/2712:00 pm
SEA
-
DCA
1 stop22h 00m
Frontier
Deal found 1/25$199
This Kiwi.com deal was found by Cheapflights users on 1/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:00 pm
DCA
-
SEA
1 stop19h 19m
Frontier
Sun 3/1512:24 pm
SEA
-
DCA
1 stop21h 38m
Frontier
Deal found 1/24$201
This Kiwi.com deal was found by Cheapflights users on 1/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:00 pm
DCA
-
SEA
2 stops27h 18m
Frontier
Mon 3/912:24 pm
SEA
-
DCA
1 stop21h 38m
Frontier
Deal found 1/23$202
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:00 pm
DCA
-
SEA
1 stop25h 01m
Frontier
Sun 3/19:23 pm
SEA
-
DCA
2 stops36h 52m
Frontier
Deal found 1/25$203
This CheapOair deal was found by Cheapflights users on 1/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:00 pm
DCA
-
SEA
1 stop19h 55m
Frontier
Mon 3/912:24 pm
SEA
-
DCA
1 stop21h 38m
Frontier
Deal found 1/26$204
This CheapOair deal was found by Cheapflights users on 1/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/192:00 pm
DCA
-
SEA
1 stop23h 55m
Frontier
Thu 2/261:16 pm
SEA
-
DCA
1 stop20h 44m
Frontier
Deal found 1/26$206
This CheapOair deal was found by Cheapflights users on 1/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/146:00 pm
DCA
-
SEA
1 stop19h 55m
Frontier
Sat 2/211:16 pm
SEA
-
DCA
1 stop20h 59m
Frontier
Deal found 1/26$212

Find flight deals from Reagan-National to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) to Seattle (SEA). 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 January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(CheapOair)

One-way from

$120
(CheapOair)

Popular in

July

Cheapest in

September

Average price

$446

Good round-trip deal

$304 or less

Good one-way deal

$191 or less
Provider with most accurate pricing for Washington, D.C. Reagan-National-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Reagan-National-Seattle/Tacoma Intl flights.
Search Deals
From Washington, D.C. Reagan-National to Seattle/Tacoma Intl
Search Deals
One-way flight from Washington, D.C. Reagan-National to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Reagan-National to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Reagan-National to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Reagan-National to Seattle 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 January 26, 2026.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Seattle that are best for you.

Fly from

Reagan-National

Fly to

Seattle

Route

Depart

Return

Price

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 3/10

5:12 pm-12:01 am

1 stop9h 49m

Seattle/Tacoma Intl

Tue 3/17

6:00 am-6:26 pm

1 stop9h 26m

$239

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 2/25

4:44 pm-7:43 pm

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 3/6

7:20 am-3:20 pm

Nonstop5h 00m

$253

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 4/22

8:00 am-10:57 am

Nonstop5h 57m

Seattle/Tacoma Intl

Thu 4/30

1:43 pm-9:59 pm

Nonstop5h 16m

$257

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 4/22

8:59 am-4:10 pm

1 stop10h 11m

Seattle/Tacoma Intl

Tue 4/28

9:07 am-9:00 pm

1 stop8h 53m

$257

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 3/12

12:00 pm-7:03 pm

1 stop10h 03m

Seattle/Tacoma Intl

Mon 3/16

11:59 pm-11:36 am

1 stop8h 37m

$277

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 2/28

5:00 pm-8:11 pm

Nonstop6h 11m

Seattle/Tacoma Intl

Wed 3/4

1:56 pm-9:59 pm

Nonstop5h 03m

$302

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 4/1

5:00 pm-10:37 pm

1 stop8h 37m

Seattle/Tacoma Intl

Thu 4/2

11:59 pm-9:59 am

1 stop7h 00m

$317

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 3/21

5:00 pm-8:02 pm

Nonstop6h 02m

Seattle/Tacoma Intl

Mon 3/23

3:50 pm-9:00 pm

1 stop26h 10m

$330

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 4/8

4:40 pm-7:34 pm

Nonstop5h 54m

Seattle/Tacoma Intl

Tue 4/14

7:30 am-3:27 pm

Nonstop4h 57m

$332

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 3/3

4:40 pm-10:35 pm

1 stop8h 55m

$129

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/24

Showing 1-10 of 20 results
1
2

Compare providers for flights from Reagan-National to Seattle

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 Reagan-National to Seattle in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
Trip.comPrice 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 Washington, D.C. Reagan-National Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Reagan-National Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Reagan-National Airport-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Reagan-National Airport-Seattle 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 Washington, D.C. Reagan-National Airport-Seattle 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 Reagan-National to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Reagan-National 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 Washington, D.C. Reagan-National Airport to Seattle

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

Use this chart to determine the optimal time to book a round-trip flight from Reagan-National to Seattle. Price data was last updated on January 23, 2026.

The best time to book flights from Washington, D.C. Reagan-National Airport to Seattle is 74 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Washington, D.C. Reagan-National Airport to Seattle?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of $140). Flying from Washington, D.C. Reagan-National Airport to Seattle in July is currently the most expensive (average of $241). 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 DCA to SEA?

Find hourly flight availability from Reagan-National to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 26, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Reagan-National Airport to Seattle as you normally would.

The best insider tips for Washington, D.C. Reagan-National Airport to Seattle 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 Washington, D.C. Reagan-National Airport to Seattle trip
Our travel experts
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
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 Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated January 26, 2026.
Get a feel of what it's like to fly with Alaska Airlines, Delta, and Hawaiian Airlines from Washington, D.C. Reagan-National Airport to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,792 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,792 reviews
Alaska Airlines
8.0
Very good
11,792 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,111 reviews
Alaska Airlines
8.0
Very good
11,792 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Hawaiian Airlines
7.8
Good
2,829 reviews
Alaska Airlines
8.0
Very good
11,792 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,199 reviews
Alaska Airlines
8.0
Very good
11,792 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Frontier
5.7
Fair
3,058 reviews
Alaska Airlines
8.0
Very good
11,792 reviews

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

Find useful and relevant information for your journey from Reagan-National to Seattle. 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 into for flights to Seattle from Washington, D.C. Reagan-National?

    For a flight from Washington, D.C. Reagan-National to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city. Seattle/Tacoma Intl is the only Seattle airport and it handles 8 inbound flights from Washington, D.C. Reagan-National per day. 7 airlines have flights to Seattle/Tacoma Intl from Washington, D.C. Reagan-National on a regular basis.

  • How long is the flight from Washington, D.C. Reagan-National Airport to Seattle?

    A quick flight from Washington, D.C. Reagan-National Airport to Seattle can take about 5h 57m. Delta provides one of the quickest options available for as low as $257. Airlines will cover a distance of 2321 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    According to our current data, Frontier ($119), Hawaiian Airlines ($168), and Delta ($179) offers the cheapest pricing from Washington, D.C. Reagan-National Airport to Seattle. These flights start at 72% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $99. Southwest flights start at $101 while deals on American Airlines start at $129 one-way.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Reagan-National Airport to Seattle on time: Japan Airlines (71%), Alaska Airlines (66%), Hawaiian Airlines (66%).

  • What are the cheapest flights from Washington, D.C. Reagan-National Airport to Seattle?

    The cheapest flight price from Washington, D.C. Reagan-National Airport to Seattle is $115. On average you can expect to pay $551. The most popular route, (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), can usually be booked for $189.

  • Can I find deals for flights from Reagan-National to Seattle that include hotel bookings?

    Yes. In addition to deals on Reagan-National to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Reagan-National to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Reagan-National to Seattle.

  • Can I find deals for business class flights from Reagan-National to Seattle?

    Yes. Cheapflights offers flight deals from Reagan-National to Seattle 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 Washington, D.C. Reagan-National Airport to Seattle?

    Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of $140). Flying from Washington, D.C. Reagan-National Airport to Seattle in July is currently the most expensive (average of $241). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

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Alternative routes for Reagan-National to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Reagan-National to Seattle

Discover the top 7 airlines that operate flights from Reagan-National to Seattle. 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 January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$119Average$289FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$168Average$477FlexibilityNo cancel feeOn-time85%
DeltaCheapest$179Average$383FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$218Average$416FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$248Average$410FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$263Average$524FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$276Average$467FlexibilityNo cancel feeOn-time71%

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