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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 188

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 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap 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 11 September 2025.

Round-trip from

C$ 331

One-way from

C$ 188

Popular in

December

Cheapest in

September

Average price

C$ 507

Good round-trip deal

C$ 248 or less
Southwest
  • Southwest
  • 21/10-29/10
  • 4 total stops
  • 20h 20m total
  • Washington, D.C. to Seattle
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Southwest
  • Southwest
  • 12/1
  • 1 total stop
  • 10h 15m total
  • Washington, D.C. to Seattle
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 28 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington, D.C. Reagan-National to Seattle/Tacoma Intl.
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Find flight deals from Reagan-National to Seattle

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 11 September 2025.

Tue 21/1011:45 a.m.DCA - SEA
2 stops11h 05mSouthwest
Wed 29/108:35 a.m.SEA - DCA
2 stops9h 15mSouthwest
Deal found 10/9C$ 331
Tue 18/114:35 p.m.DCA - SEA
1 stop8h 55mSouthwest
Mon 24/116:35 a.m.SEA - DCA
1 stop7h 55mSouthwest
Deal found 9/9C$ 333
Mon 10/114:50 p.m.DCA - SEA
1 stop10h 40mSouthwest
Wed 12/115:40 a.m.SEA - DCA
2 stops9h 35mSouthwest
Deal found 10/9C$ 340
Thu 4/1212:55 p.m.DCA - SEA
2 stops10h 45mSouthwest
Mon 8/126:35 a.m.SEA - DCA
1 stop8h 40mSouthwest
Deal found 11/9C$ 341
Sat 1/115:00 p.m.DCA - SEA
Nonstop6h 03mHawaiian Airlines
Tue 4/111:52 p.m.SEA - DCA
Nonstop5h 07mHawaiian Airlines
Deal found 10/9C$ 356
Wed 29/1011:45 a.m.DCA - SEA
2 stops11h 05mSouthwest
Sun 2/115:35 a.m.SEA - DCA
1 stop7h 55mSouthwest
Deal found 10/9C$ 358
Mon 10/114:50 p.m.DCA - SEA
1 stop10h 40mSouthwest
Sat 15/115:00 a.m.SEA - DCA
2 stops12h 15mSouthwest
Deal found 10/9C$ 362
Wed 1/106:05 a.m.DCA - SEA
1 stop9h 50mSouthwest
Wed 8/109:10 a.m.SEA - DCA
1 stop8h 25mSouthwest
Deal found 10/9C$ 367
Wed 29/108:59 a.m.DCA - SEA
1 stop12h 54mHawaiian Airlines
Mon 3/111:52 p.m.SEA - DCA
Nonstop5h 07mHawaiian Airlines
Deal found 9/9C$ 370
Tue 11/112:40 p.m.DCA - SEA
2 stops11h 15mSouthwest
Fri 14/115:35 a.m.SEA - DCA
2 stops9h 40mSouthwest
Deal found 11/9C$ 374
Fri 10/106:00 a.m.DCA - SEA
1 stop9h 51mUnited Airlines
Mon 13/1010:50 a.m.SEA - DCA
1 stop7h 13mUnited Airlines
Deal found 10/9C$ 377

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 11 September 2025.
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 26/11

5:00 p.m.-8:05 p.m.

Nonstop6h 05m

Seattle/Tacoma Intl

Thu 4/12

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

Nonstop5h 03m

C$ 356

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 22/10

12:35 p.m.-10:45 p.m.

2 stops13h 10m

Seattle/Tacoma Intl

Sat 25/10

5:45 a.m.-3:15 p.m.

1 stop6h 30m

C$ 358

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 7/11

3:30 p.m.-10:45 p.m.

1 stop10h 15m

Seattle/Tacoma Intl

Mon 10/11

11:59 p.m.-9:53 a.m.

1 stop6h 54m

C$ 384

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 4/12

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

Nonstop6h 11m

Seattle/Tacoma Intl

Tue 9/12

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

Nonstop5h 03m

C$ 384

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 24/11

8:00 a.m.-11:05 a.m.

Nonstop6h 05m

Seattle/Tacoma Intl

Thu 27/11

8:00 a.m.-4:06 p.m.

Nonstop5h 06m

C$ 384

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 11/12

12:55 p.m.-8:40 p.m.

2 stops10h 45m

Seattle/Tacoma Intl

Sun 14/12

6:35 a.m.-5:30 p.m.

1 stop7h 55m

C$ 388

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 3/3

9:30 a.m.-9:56 a.m.

1 stop27h 26m

Seattle/Tacoma Intl

Wed 4/3

1:45 p.m.-9:55 p.m.

Nonstop5h 10m

C$ 389

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 7/11

3:10 p.m.-12:05 a.m.

2 stops11h 55m

Seattle/Tacoma Intl

Tue 11/11

5:40 a.m.-6:45 p.m.

2 stops10h 05m

C$ 392

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 2/1

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

Nonstop6h 00m

Seattle/Tacoma Intl

Sat 10/1

1:45 p.m.-9:55 p.m.

Nonstop5h 10m

C$ 418

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 25/10

4:59 p.m.-7:50 p.m.

Nonstop5h 51m

Seattle/Tacoma Intl

Sat 1/11

7:25 a.m.-3:28 p.m.

Nonstop5h 03m

C$ 425

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 19 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 29 August 2025.

Booking 85 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$ 262). Flying from Washington, D.C. Reagan-National Airport to Seattle in December is currently the most expensive (average of C$ 353). 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 11 September 2025.

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 6h 05m. Fly via Southwest, Alaska Airlines, 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: Japan Airlines (82%), Korean Air (82%), Finnair( 78%).

  • 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$ 248, our data indicates the cheapest price to be C$ 248. The most popular route (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), is priced around C$ 1,183.

  • 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$ 262). Flying from Washington, D.C. Reagan-National Airport to Seattle in December is currently the most expensive (average of C$ 353). 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
Leavenworth
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Tukwila
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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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