Find flights
Deals
When to book
FAQs

Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 242

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 13/8. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
14 Jul — 21 Jul1
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 14 June 2026.

Thu 13/84:55 p.m.
DCA
-
SEA
2 stops10h 45m
Southwest
Tue 18/811:00 p.m.
SEA
-
DCA
1 stop10h 05m
Southwest
Deal found 10/6C$ 453
Tue 18/85:00 p.m.
DCA
-
SEA
Nonstop5h 59m
Alaska Airlines
Mon 24/88:48 a.m.
SEA
-
DCA
1 stop9h 12m
Alaska Airlines
Deal found 14/6C$ 454
Sat 22/86:05 a.m.
DCA
-
SEA
2 stops16h 25m
Southwest
Mon 31/811:05 p.m.
SEA
-
DCA
1 stop6h 50m
Southwest
Deal found 14/6C$ 456
Thu 17/92:30 p.m.
DCA
-
SEA
1 stop11h 08m
JetBlue
Tue 22/911:55 p.m.
SEA
-
DCA
1 stop11h 55m
JetBlue
Deal found 10/6C$ 459
Tue 4/85:00 p.m.
DCA
-
SEA
Nonstop5h 59m
Alaska Airlines
Thu 13/86:21 a.m.
SEA
-
DCA
1 stop11h 39m
Alaska Airlines
Deal found 10/6C$ 461
Mon 20/76:15 a.m.
DCA
-
SEA
1 stop14h 10m
Southwest
Tue 21/75:15 a.m.
SEA
-
DCA
2 stops12h 40m
Southwest
Deal found 10/6C$ 463
Mon 27/77:05 p.m.
DCA
-
SEA
1 stop8h 30m
Southwest
Mon 3/810:45 p.m.
SEA
-
DCA
1 stop7h 05m
Southwest
Deal found 11/6C$ 468
Fri 7/84:35 p.m.
DCA
-
SEA
1 stop10h 45m
Southwest
Fri 21/85:00 a.m.
SEA
-
DCA
2 stops9h 50m
Southwest
Deal found 10/6C$ 470
Fri 18/92:00 p.m.
DCA
-
SEA
1 stop8h 15m
United Airlines
Sun 20/911:00 p.m.
SEA
-
DCA
1 stop6h 55m
United Airlines
Deal found 14/6C$ 471
Tue 25/83:50 p.m.
DCA
-
SEA
2 stops10h 15m
Southwest
Tue 1/96:40 a.m.
SEA
-
DCA
2 stops9h 30m
Southwest
Deal found 10/6C$ 473
Thu 27/83:30 p.m.
DCA
-
SEA
1 stop10h 13m
United Airlines
Fri 4/97:00 a.m.
SEA
-
DCA
1 stop7h 09m
United Airlines
Deal found 14/6C$ 474
Fri 14/84:35 p.m.
DCA
-
SEA
1 stop10h 45m
Southwest
Tue 18/86:40 a.m.
SEA
-
DCA
2 stops9h 30m
Southwest
Deal found 11/6C$ 475

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 14 June 2026.

Round-trip from

C$ 453

One-way from

C$ 242

Popular in

June

Cheapest in

February

Average price

C$ 849
Southwest
  • Southwest
  • 24/8-28/8
  • 3 total stops
  • 17h 20m total
  • Washington, D.C. to Seattle
Search Deals
Delta
  • Delta
  • 13/8
  • Nonstop
  • 6h 06m total
  • Washington, D.C. to Seattle
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (C$ 198 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 14 June 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

Tue 18/8

8:59 a.m.-4:58 p.m.

1 stop10h 59m

Seattle/Tacoma Intl

Mon 24/8

8:48 a.m.-9:00 p.m.

1 stop9h 12m

C$ 475

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 18/9

3:30 p.m.-10:55 p.m.

2 stops10h 25m

Seattle/Tacoma Intl

Wed 23/9

11:05 p.m.-8:30 a.m.

1 stop6h 25m

C$ 498

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 20/9

5:35 p.m.-12:50 a.m.

1 stop10h 15m

Seattle/Tacoma Intl

Mon 28/9

5:00 a.m.-5:50 p.m.

2 stops9h 50m

C$ 531
Quickest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 22/8

4:35 p.m.-7:41 p.m.

Nonstop6h 06m

Seattle/Tacoma Intl

Mon 31/8

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

Nonstop5h 01m

C$ 533

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 3/7

4:25 p.m.-12:50 a.m.

1 stop11h 25m

Seattle/Tacoma Intl

Wed 8/7

7:35 a.m.-8:55 p.m.

2 stops10h 20m

C$ 566

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 16/10

4:40 p.m.-7:45 p.m.

Nonstop6h 05m

Seattle/Tacoma Intl

Mon 19/10

7:23 a.m.-3:34 p.m.

Nonstop5h 11m

C$ 569

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 14/8

5:00 p.m.-7:59 p.m.

Nonstop5h 59m

Seattle/Tacoma Intl

Tue 18/8

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

1 stop10h 34m

C$ 573

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 30/8

6:10 p.m.-11:10 p.m.

1 stop8h 00m

Seattle/Tacoma Intl

Mon 7/9

5:00 a.m.-8:55 p.m.

2 stops12h 55m

C$ 575

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 24/7

11:40 a.m.-8:10 p.m.

2 stops11h 30m

Seattle/Tacoma Intl

Thu 20/8

6:15 a.m.-11:55 p.m.

2 stops14h 40m

C$ 631

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 23/7

4:35 p.m.-7:41 p.m.

Nonstop6h 06m

Seattle/Tacoma Intl

Thu 30/7

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

Nonstop5h 01m

C$ 639

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/6

Showing 1-10 of 24 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 78 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$ 410). Flying from Washington, D.C. Reagan-National Airport to Seattle in June is currently the most expensive (average of C$ 849). 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 14 June 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 3 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 05m. Fly via Alaska Airlines, Southwest, or Delta 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: Finnair (100%), Korean Air (100%), Japan Airlines( 98%).

  • 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$ 410). Flying from Washington, D.C. Reagan-National Airport to Seattle in June is currently the most expensive (average of C$ 849). 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
Kent
Leavenworth
Mukilteo
Tacoma
Renton
Cashmere
Tukwila
Olympia
Marysville
Kirkland

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.