Find flights
Deals
When to book
FAQs

Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 209

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 2/8. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
28 May — 4 Jun1
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 28 April 2026.

Wed 19/84:40 p.m.
DCA
-
SEA
1 stop9h 45m
Southwest
Mon 24/811:00 p.m.
SEA
-
DCA
1 stop10h 05m
Southwest
Deal found 23/4C$ 361
Wed 12/86:40 p.m.
DCA
-
SEA
1 stop7h 55m
Southwest
Wed 19/811:05 p.m.
SEA
-
DCA
1 stop6h 25m
Southwest
Deal found 23/4C$ 365
Thu 13/86:40 p.m.
DCA
-
SEA
1 stop7h 50m
Southwest
Sat 22/811:00 p.m.
SEA
-
DCA
1 stop10h 45m
Southwest
Deal found 26/4C$ 368
Tue 28/76:55 p.m.
DCA
-
SEA
1 stop8h 25m
Southwest
Wed 2/95:20 a.m.
SEA
-
DCA
2 stops10h 05m
Southwest
Deal found 23/4C$ 372
Tue 11/84:50 p.m.
DCA
-
SEA
2 stops9h 15m
Southwest
Wed 19/811:05 p.m.
SEA
-
DCA
1 stop9h 45m
Southwest
Deal found 23/4C$ 376
Wed 12/82:00 p.m.
DCA
-
SEA
1 stop7h 59m
United Airlines
Thu 3/97:00 a.m.
SEA
-
DCA
1 stop8h 25m
United Airlines
Deal found 27/4C$ 401
Thu 4/64:40 p.m.
DCA
-
SEA
Nonstop5h 42m
Delta
Sat 6/67:20 a.m.
SEA
-
DCA
Nonstop5h 08m
Delta
Deal found 23/4C$ 402
Tue 23/66:10 p.m.
DCA
-
SEA
1 stop8h 49m
United Airlines
Tue 30/611:52 p.m.
SEA
-
DCA
1 stop7h 07m
United Airlines
Deal found 23/4C$ 404
Mon 22/67:10 p.m.
DCA
-
SEA
1 stop7h 49m
United Airlines
Tue 30/611:52 p.m.
SEA
-
DCA
1 stop7h 07m
United Airlines
Deal found 24/4C$ 408
Sat 19/96:05 a.m.
DCA
-
SEA
2 stops11h 15m
Southwest
Mon 21/95:15 a.m.
SEA
-
DCA
1 stop6h 35m
Southwest
Deal found 23/4C$ 409
Mon 14/95:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Wed 23/91:43 p.m.
SEA
-
DCA
Nonstop5h 16m
Alaska Airlines
Deal found 23/4C$ 412
Tue 4/87:10 p.m.
DCA
-
SEA
1 stop8h 04m
United Airlines
Fri 14/811:56 p.m.
SEA
-
DCA
1 stop8h 29m
United Airlines
Deal found 26/4C$ 413

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 28 April 2026.

Round-trip from

C$ 361

One-way from

C$ 209

Popular in

March

Cheapest in

February

Average price

C$ 570
Southwest
  • Southwest
  • 19/8-24/8
  • 2 total stops
  • 19h 50m total
  • Washington, D.C. to Seattle
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 25/8
  • Nonstop
  • 5h 54m total
  • Washington, D.C. to Seattle
Search Deals
High demand for flights, 1% 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 28 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

Sat 19/9

5:00 p.m.-10:42 p.m.

1 stop8h 42m

Seattle/Tacoma Intl

Mon 21/9

10:47 p.m.-10:17 a.m.

1 stop8h 30m

C$ 511

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 6/6

5:00 p.m.-8:01 p.m.

Nonstop6h 01m

Seattle/Tacoma Intl

Tue 9/6

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

Nonstop5h 14m

C$ 519

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 30/5

6:25 p.m.-10:48 p.m.

1 stop7h 23m

Seattle/Tacoma Intl

Sat 6/6

7:20 a.m.-3:28 p.m.

Nonstop5h 08m

C$ 553

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 14/7

6:59 p.m.-8:13 a.m.

1 stop16h 14m

Seattle/Tacoma Intl

Sat 18/7

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

1 stop10h 34m

C$ 559

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 10/6

11:00 a.m.-8:19 p.m.

1 stop12h 19m

Seattle/Tacoma Intl

Tue 16/6

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

Nonstop5h 06m

C$ 574

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 21/10

1:05 p.m.-9:10 p.m.

2 stops11h 05m

Seattle/Tacoma Intl

Wed 28/10

11:15 a.m.-11:55 p.m.

2 stops9h 40m

C$ 582

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 9/6

6:55 p.m.-12:20 a.m.

1 stop8h 25m

Seattle/Tacoma Intl

Tue 16/6

5:15 a.m.-6:55 p.m.

2 stops10h 40m

C$ 594

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 1/6

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

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 5/6

8:00 a.m.-4:19 p.m.

Nonstop5h 19m

C$ 635

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 1/6

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$ 637
Quickest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 4/6

4:40 p.m.-7:22 p.m.

Nonstop5h 42m

Seattle/Tacoma Intl

Thu 11/6

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

Nonstop5h 06m

C$ 650

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/4

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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?

Booking 51 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, February is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 399). Flying from Washington, D.C. Reagan-National Airport to Seattle in March is currently the most expensive (average of C$ 744). 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 28 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 6h 01m. Fly via Alaska Airlines, Delta, 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 (85%), Korean Air (85%), Alaska Airlines( 70%).

  • 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, February is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 399). Flying from Washington, D.C. Reagan-National Airport to Seattle in March is currently the most expensive (average of C$ 744). 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?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Leavenworth
Mukilteo
Kent
Tacoma
Bothell
Cashmere
Olympia
Renton
Marysville
Lynnwood
Kirkland
Tukwila

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.

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 Reagan-National to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Reagan-National to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Reagan-National to Seattle?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Seattle from Reagan-National.

Can Cheapflights find flights from Reagan-National to Seattle with no change fees?

Yes! Cheapflights helps users easily find flights from Reagan-National to Seattle with no change fees.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.