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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 170

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
9 Apr — 16 Apr1
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 10 March 2026.

Wed 22/47:00 p.m.
DCA
-
SEA
1 stop8h 10m
Southwest
Wed 29/46:00 a.m.
SEA
-
DCA
1 stop7h 15m
Southwest
Deal found 10/3C$ 270
Sat 4/44:40 p.m.
DCA
-
SEA
Nonstop5h 54m
Delta
Wed 15/411:14 p.m.
SEA
-
DCA
1 stop6h 23m
Delta
Deal found 8/3C$ 277
Tue 21/44:39 p.m.
DCA
-
SEA
Nonstop5h 51m
Delta
Tue 28/47:30 a.m.
SEA
-
DCA
Nonstop4h 57m
Delta
Deal found 6/3C$ 281
Wed 22/42:40 p.m.
DCA
-
SEA
2 stops10h 50m
Southwest
Wed 22/411:45 p.m.
SEA
-
DCA
1 stop11h 15m
Southwest
Deal found 6/3C$ 285
Tue 7/47:00 p.m.
DCA
-
SEA
1 stop8h 10m
Southwest
Tue 14/411:45 p.m.
SEA
-
DCA
1 stop11h 35m
Southwest
Deal found 10/3C$ 291
Mon 27/47:45 p.m.
DCA
-
SEA
2 stops15h 55m
Southwest
Sat 2/55:45 a.m.
SEA
-
DCA
2 stops8h 50m
Southwest
Deal found 10/3C$ 292
Wed 29/44:39 p.m.
DCA
-
SEA
Nonstop5h 51m
Delta
Sat 9/57:20 a.m.
SEA
-
DCA
Nonstop5h 10m
Delta
Deal found 9/3C$ 296
Tue 7/44:40 p.m.
DCA
-
SEA
Nonstop5h 54m
Delta
Tue 14/46:00 a.m.
SEA
-
DCA
1 stop9h 00m
Delta
Deal found 10/3C$ 304
Tue 21/46:00 a.m.
DCA
-
SEA
1 stop7h 32m
Delta
Sat 25/47:30 a.m.
SEA
-
DCA
Nonstop4h 57m
Delta
Deal found 9/3C$ 310
Tue 21/44:39 p.m.
DCA
-
SEA
Nonstop5h 51m
Delta
Fri 24/410:40 p.m.
SEA
-
DCA
1 stop8h 39m
Delta
Deal found 10/3C$ 311

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 10 March 2026.

Round-trip from

C$ 270

One-way from

C$ 170

Popular in

July

Cheapest in

February

Average price

C$ 641
Southwest
  • Southwest
  • 22/4-29/4
  • 2 total stops
  • 15h 25m total
  • Washington, D.C. to Seattle
Search Deals
United Airlines
  • United Airlines
  • 9/5
  • 2 total stops
  • 13h 49m total
  • Washington, D.C. to Seattle
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 103 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 10 March 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

Fri 1/5

6:59 p.m.-11:54 p.m.

1 stop7h 55m

Seattle/Tacoma Intl

Tue 5/5

10:40 p.m.-10:19 a.m.

1 stop8h 39m

C$ 405

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 20/4

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

2 stops10h 40m

Seattle/Tacoma Intl

Mon 27/4

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

2 stops9h 55m

C$ 432
Quickest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 22/4

4:39 p.m.-7:30 p.m.

Nonstop5h 51m

Seattle/Tacoma Intl

Sun 3/5

7:30 a.m.-3:27 p.m.

Nonstop4h 57m

C$ 466

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 25/3

6:30 a.m.-11:49 a.m.

1 stop8h 19m

Seattle/Tacoma Intl

Sun 29/3

11:59 p.m.-9:59 a.m.

1 stop7h 00m

C$ 512

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 15/8

6:05 a.m.-2:20 p.m.

2 stops11h 15m

Seattle/Tacoma Intl

Sat 22/8

11:05 p.m.-8:55 a.m.

1 stop6h 50m

C$ 519

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 17/8

5:16 p.m.-10:27 p.m.

1 stop8h 11m

Seattle/Tacoma Intl

Mon 24/8

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

1 stop9h 00m

C$ 539

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 20/5

3:40 p.m.-11:35 p.m.

2 stops10h 55m

Seattle/Tacoma Intl

Sun 24/5

5:45 a.m.-4:50 p.m.

1 stop8h 05m

C$ 546

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 1/6

5:19 p.m.-10:34 p.m.

1 stop8h 15m

Seattle/Tacoma Intl

Tue 9/6

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

1 stop10h 34m

C$ 566

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 3/9

6:55 a.m.-1:55 p.m.

1 stop10h 00m

Seattle/Tacoma Intl

Sat 12/9

11:05 p.m.-12:45 p.m.

2 stops10h 40m

C$ 573

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 1/4

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

1 stop8h 00m

Seattle/Tacoma Intl

Mon 6/4

9:55 p.m.-6:05 p.m.

2 stops17h 10m

C$ 589

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/3

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 6 March 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, May is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 212). Flying from Washington, D.C. Reagan-National Airport to Seattle in July is currently the most expensive (average of C$ 330). 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 10 March 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.

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 5 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 5h 51m. Fly via Southwest, Delta, or United Airlines 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: Korean Air (71%), Japan Airlines (70%), Alaska Airlines( 69%).

  • 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, May is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 212). Flying from Washington, D.C. Reagan-National Airport to Seattle in July is currently the most expensive (average of C$ 330). 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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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.

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