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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 181

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
12 May — 19 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Reagan-National to Seattle

Enter your travel dates to find the best prices.

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 12 April 2026.

Sat 15/82:00 p.m.
DCA
-
SEA
1 stop7h 59m
United Airlines
Tue 25/810:54 a.m.
SEA
-
DCA
1 stop7h 59m
United Airlines
Deal found 10/4C$ 367
Wed 10/64:25 p.m.
DCA
-
SEA
2 stops11h 05m
Southwest
Thu 18/610:45 p.m.
SEA
-
DCA
1 stop6h 40m
Southwest
Deal found 7/4C$ 374
Tue 21/74:25 p.m.
DCA
-
SEA
1 stop10h 55m
Southwest
Wed 5/811:00 p.m.
SEA
-
DCA
1 stop10h 20m
Southwest
Deal found 11/4C$ 382
Mon 13/77:10 p.m.
DCA
-
SEA
1 stop8h 04m
United Airlines
Thu 23/711:52 p.m.
SEA
-
DCA
1 stop8h 09m
United Airlines
Deal found 7/4C$ 394
Mon 13/77:10 p.m.
DCA
-
SEA
1 stop8h 04m
United Airlines
Thu 30/77:05 a.m.
SEA
-
DCA
1 stop8h 26m
United Airlines
Deal found 8/4C$ 396
Tue 16/67:10 p.m.
DCA
-
SEA
1 stop7h 49m
United Airlines
Thu 25/611:52 p.m.
SEA
-
DCA
1 stop7h 07m
United Airlines
Deal found 9/4C$ 397
Sun 23/82:50 p.m.
DCA
-
SEA
1 stop9h 31m
United Airlines
Thu 27/87:00 a.m.
SEA
-
DCA
1 stop6h 52m
United Airlines
Deal found 10/4C$ 404
Tue 14/74:35 p.m.
DCA
-
SEA
Nonstop6h 06m
Delta
Wed 22/77:20 a.m.
SEA
-
DCA
Nonstop5h 01m
Delta
Deal found 10/4C$ 408
Thu 13/82:00 p.m.
DCA
-
SEA
1 stop7h 59m
United Airlines
Sat 22/811:56 p.m.
SEA
-
DCA
1 stop8h 29m
United Airlines
Deal found 10/4C$ 411
Tue 28/72:00 p.m.
DCA
-
SEA
1 stop8h 06m
United Airlines
Thu 30/710:29 a.m.
SEA
-
DCA
1 stop8h 46m
United Airlines
Deal found 9/4C$ 412
Tue 15/98:00 a.m.
DCA
-
SEA
Nonstop5h 54m
Alaska Airlines
Tue 22/96:50 a.m.
SEA
-
DCA
1 stop10h 10m
Alaska Airlines
Deal found 7/4C$ 415
Sat 1/81:00 p.m.
DCA
-
SEA
1 stop14h 05m
Southwest
Wed 12/811:05 p.m.
SEA
-
DCA
1 stop9h 45m
Southwest
Deal found 8/4C$ 422

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 12 April 2026.

Round-trip from

C$ 367

One-way from

C$ 181

Popular in

March

Cheapest in

February

Average price

C$ 588
United Airlines
  • United Airlines
  • 15/8-25/8
  • 2 total stops
  • 15h 58m total
  • Washington, D.C. to Seattle
Search Deals
Frontier
  • Frontier
  • 27/5
  • 1 total stop
  • 30h 06m total
  • Washington, D.C. to Seattle
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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 629,999 searches. Data last updated 12 April 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 30/8

2:00 p.m.-6:59 p.m.

1 stop7h 59m

Seattle/Tacoma Intl

Sat 5/9

11:00 p.m.-9:24 a.m.

1 stop7h 24m

C$ 396

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 12/5

8:59 a.m.-4:10 p.m.

1 stop10h 11m

Seattle/Tacoma Intl

Sat 16/5

7:26 a.m.-9:00 p.m.

1 stop10h 34m

C$ 494

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 1/5

5:15 p.m.-12:55 a.m.

2 stops10h 40m

Seattle/Tacoma Intl

Mon 1/6

5:15 a.m.-4:35 p.m.

1 stop8h 20m

C$ 501

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 18/8

2:00 p.m.-6:59 p.m.

1 stop7h 59m

Seattle/Tacoma Intl

Sat 22/8

11:56 p.m.-11:25 a.m.

1 stop8h 29m

C$ 519

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 28/5

8:00 a.m.-10:59 a.m.

Nonstop5h 59m

Seattle/Tacoma Intl

Wed 3/6

1:45 p.m.-9:59 p.m.

Nonstop5h 14m

C$ 529

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 17/9

12:25 p.m.-6:20 p.m.

1 stop8h 55m

Seattle/Tacoma Intl

Wed 23/9

11:10 a.m.-11:55 p.m.

2 stops9h 45m

C$ 541

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 27/8

12:25 p.m.-6:20 p.m.

1 stop8h 55m

Seattle/Tacoma Intl

Tue 1/9

5:20 a.m.-6:25 p.m.

2 stops10h 05m

C$ 559

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 9/6

4:36 p.m.-7:30 p.m.

Nonstop5h 54m

Seattle/Tacoma Intl

Sun 14/6

11:10 p.m.-8:37 a.m.

1 stop6h 27m

C$ 560

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 5/6

5:59 p.m.-12:10 a.m.

1 stop9h 11m

Seattle/Tacoma Intl

Thu 11/6

7:20 a.m.-3:26 p.m.

Nonstop5h 06m

C$ 560

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 11/7

5:29 p.m.-10:33 p.m.

1 stop8h 04m

Seattle/Tacoma Intl

Wed 29/7

7:20 a.m.-3:21 p.m.

Nonstop5h 01m

C$ 560

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/4

Showing 1-10 of 24 resultsSorted by cheapest first
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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 9 April 2026.

Booking 52 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. Reagan-National Airport to Seattle. 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 Washington, D.C. Reagan-National Airport to Seattle?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 220). Flying from Washington, D.C. Reagan-National Airport to Seattle in August is currently the most expensive (average of C$ 334). 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 12 April 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.

How much does it cost to fly round-trip from Washington, D.C. Reagan-National Airport to Seattle?

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?

    Located just 18.4 km from the city centre, Seattle/Tacoma Intl is the airport most travellers will use when flying to Seattle from Washington, D.C. Reagan-National. Booking flights from Washington, D.C. Reagan-National to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 4 daily inbound flights from Washington, D.C. Reagan-National from 0 different airlines.

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

    There are many flights that can get you from Washington, D.C. Reagan-National Airport to Seattle in 7h 59m. Fly via United Airlines, Alaska Airlines, or Southwest to get the fastest option. Airlines will cover a distance of 3735 km. This flight may include one or multiple stops.

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

    Before booking your flight to Seattle from Washington, D.C. Reagan-National Airport, check out the most reliable airlines to get you to your destination on time: Japan Airlines (79%), Korean Air (79%), Alaska Airlines( 65%).

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 220). Flying from Washington, D.C. Reagan-National Airport to Seattle in August is currently the most expensive (average of C$ 334). 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 Seattle?

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Can Cheapflights notify me if prices for flights from Reagan-National to Seattle become cheaper?

Yes, Cheapflights offers price alerts on Reagan-National to Seattle 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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