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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 171

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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
25 Feb — 4 Mar1
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 26 January 2026.

Tue 17/28:00 a.m.
DCA
-
SEA
Nonstop5h 55m
Alaska Airlines
Tue 24/28:00 a.m.
SEA
-
DCA
Nonstop5h 06m
Alaska Airlines
Deal found 26/1C$ 325
Tue 7/47:00 a.m.
DCA
-
SEA
2 stops12h 14m
Frontier
Tue 14/46:57 p.m.
SEA
-
DCA
1 stop24h 02m
Frontier
Deal found 25/1C$ 336
Tue 7/45:00 p.m.
DCA
-
SEA
Nonstop6h 02m
Hawaiian Airlines
Tue 14/41:53 p.m.
SEA
-
DCA
Nonstop5h 06m
Hawaiian Airlines
Deal found 25/1C$ 337
Wed 25/26:30 a.m.
DCA
-
SEA
1 stop8h 19m
United Airlines
Tue 10/311:59 p.m.
SEA
-
DCA
1 stop7h 30m
United Airlines
Deal found 26/1C$ 352
Tue 24/22:00 p.m.
DCA
-
SEA
1 stop8h 03m
United Airlines
Tue 3/39:00 a.m.
SEA
-
DCA
2 stops9h 59m
United Airlines
Deal found 25/1C$ 359
Tue 17/25:06 p.m.
DCA
-
SEA
1 stop8h 12m
Alaska Airlines
Fri 20/21:56 p.m.
SEA
-
DCA
Nonstop5h 03m
Alaska Airlines
Deal found 26/1C$ 366
Fri 20/21:00 p.m.
DCA
-
SEA
1 stop9h 03m
United Airlines
Wed 4/311:59 p.m.
SEA
-
DCA
1 stop7h 56m
United Airlines
Deal found 26/1C$ 382
Wed 25/24:44 p.m.
DCA
-
SEA
Nonstop5h 59m
Delta
Wed 4/37:20 a.m.
SEA
-
DCA
Nonstop5h 00m
Delta
Deal found 25/1C$ 393
Tue 2/68:00 a.m.
DCA
-
SEA
Nonstop5h 59m
Alaska Airlines
Tue 9/61:45 p.m.
SEA
-
DCA
Nonstop5h 14m
Alaska Airlines
Deal found 26/1C$ 400
Tue 2/68:59 a.m.
DCA
-
SEA
1 stop12h 16m
Alaska Airlines
Sat 6/67:00 a.m.
SEA
-
DCA
1 stop11h 00m
Alaska Airlines
Deal found 26/1C$ 407
Wed 25/29:59 a.m.
DCA
-
SEA
1 stop16h 44m
Alaska Airlines
Tue 10/31:56 p.m.
SEA
-
DCA
Nonstop5h 03m
Alaska Airlines
Deal found 26/1C$ 411

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 26 January 2026.

Round-trip from

C$ 300

One-way from

C$ 171

Popular in

July

Cheapest in

September

Average price

C$ 611

Good round-trip deal

C$ 245 or less
Delta
  • Delta
  • 25/2-4/3
  • Nonstop
  • 10h 59m total
  • Washington, D.C. to Seattle
Search Deals
Frontier
  • Frontier
  • 7/2
  • 1 total stop
  • 30h 19m total
  • Washington, D.C. to Seattle
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 72 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 14 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

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 26 January 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

Wed 25/2

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

1 stop8h 19m

Seattle/Tacoma Intl

Tue 10/3

11:59 p.m.-10:29 a.m.

1 stop7h 30m

C$ 352

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 25/2

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 6/3

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

Nonstop5h 00m

C$ 393

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 28/2

5:00 p.m.-8:11 p.m.

Nonstop6h 11m

Seattle/Tacoma Intl

Wed 4/3

1:56 p.m.-9:59 p.m.

Nonstop5h 03m

C$ 414

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 7/4

7:55 a.m.-12:45 p.m.

1 stop7h 50m

Seattle/Tacoma Intl

Tue 14/4

6:00 a.m.-4:15 p.m.

1 stop7h 15m

C$ 427

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 13/5

8:59 a.m.-3:59 p.m.

1 stop10h 00m

Seattle/Tacoma Intl

Tue 19/5

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

1 stop9h 00m

C$ 434

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 25/2

4:44 p.m.-7:43 p.m.

Nonstop5h 59m

Seattle/Tacoma Intl

Tue 10/3

7:25 a.m.-3:22 p.m.

Nonstop4h 57m

C$ 449

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 21/3

5:00 p.m.-8:02 p.m.

Nonstop6h 02m

Seattle/Tacoma Intl

Mon 23/3

3:50 p.m.-9:00 p.m.

1 stop26h 10m

C$ 452

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 8/4

4:40 p.m.-7:34 p.m.

Nonstop5h 54m

Seattle/Tacoma Intl

Tue 14/4

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

Nonstop4h 57m

C$ 455

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 8/4

4:50 p.m.-11:55 p.m.

2 stops10h 05m

Seattle/Tacoma Intl

Tue 14/4

6:00 a.m.-6:40 p.m.

2 stops9h 40m

C$ 468

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 23/5

4:40 p.m.-7:46 p.m.

Nonstop6h 06m

Seattle/Tacoma Intl

Sat 30/5

7:23 a.m.-3:40 p.m.

Nonstop5h 17m

C$ 468

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/1

Showing 1-10 of 22 results
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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 23 January 2026.

Booking 74 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, March is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 192). 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 26 January 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 8 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 59m. Fly via United 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 (71%), Alaska Airlines (66%), Hawaiian Airlines( 66%).

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

    Looking for the cheapest flight from Washington, D.C. Reagan-National Airport to Seattle? While on average our users pay C$ 245, our data indicates the cheapest price to be C$ 245. The most popular route (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), is priced around C$ 337.

  • 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 C$ 192). 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

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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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