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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 195

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 26/11. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
26 Nov — 3 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 27 October 2025.

Mon 8/125:00 p.m.DCA - SEA
Nonstop6h 13mAlaska Airlines
Tue 16/121:56 p.m.SEA - DCA
Nonstop5h 03mAlaska Airlines
Deal found 27/10C$ 360
Tue 16/128:59 a.m.DCA - SEA
1 stop11h 28mAlaska Airlines
Sat 10/17:15 a.m.SEA - DCA
1 stop10h 45mAlaska Airlines
Deal found 26/10C$ 374
Tue 16/128:59 a.m.DCA - SEA
1 stop11h 28mAlaska Airlines
Thu 8/11:55 p.m.SEA - DCA
Nonstop5h 04mAlaska Airlines
Deal found 26/10C$ 389
Sat 15/116:30 a.m.DCA - SEA
2 stops10h 45mSouthwest
Mon 24/116:35 a.m.SEA - DCA
1 stop7h 55mSouthwest
Deal found 25/10C$ 410
Sun 14/123:10 p.m.DCA - SEA
1 stop7h 50mSouthwest
Wed 17/126:35 a.m.SEA - DCA
1 stop8h 40mSouthwest
Deal found 26/10C$ 416
Tue 16/124:55 p.m.DCA - SEA
Nonstop5h 53mDelta
Sat 10/17:20 a.m.SEA - DCA
Nonstop5h 00mDelta
Deal found 26/10C$ 417
Wed 10/125:00 p.m.DCA - SEA
Nonstop6h 13mAlaska Airlines
Mon 15/121:56 p.m.SEA - DCA
Nonstop5h 03mAlaska Airlines
Deal found 27/10C$ 423
Thu 25/125:00 p.m.DCA - SEA
Nonstop5h 55mDelta
Thu 1/17:35 a.m.SEA - DCA
Nonstop5h 01mDelta
Deal found 27/10C$ 430
Thu 20/111:00 p.m.DCA - SEA
1 stop8h 52mUnited Airlines
Mon 24/1112:35 p.m.SEA - DCA
1 stop7h 07mUnited Airlines
Deal found 26/10C$ 437
Fri 21/1111:40 a.m.DCA - SEA
1 stop11h 20mSouthwest
Mon 24/116:35 a.m.SEA - DCA
1 stop7h 55mSouthwest
Deal found 25/10C$ 451

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 27 October 2025.

Round-trip from

C$ 334

One-way from

C$ 195

Popular in

April

Cheapest in

September

Average price

C$ 612

Good round-trip deal

C$ 251 or less
Alaska Airlines
  • Alaska Airlines
  • 13/1-23/1
  • Nonstop
  • 11h 04m total
  • Washington, D.C. to Seattle
Search Deals
Southwest
  • Southwest
  • 5/1
  • 1 total stop
  • 10h 40m total
  • Washington, D.C. to Seattle
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 7 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Reagan-National to Seattle/Tacoma Intl.
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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 27 October 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 14/1

5:01 p.m.-8:07 p.m.

Nonstop6h 06m

Seattle/Tacoma Intl

Sun 18/1

8:00 a.m.-4:09 p.m.

Nonstop5h 09m

C$ 347

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 10/12

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

Nonstop6h 11m

Seattle/Tacoma Intl

Mon 15/12

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

Nonstop5h 03m

C$ 360

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 8/12

5:00 p.m.-8:13 p.m.

Nonstop6h 13m

Seattle/Tacoma Intl

Tue 16/12

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

Nonstop5h 03m

C$ 360

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 3/3

9:30 a.m.-6:51 p.m.

1 stop12h 21m

Seattle/Tacoma Intl

Wed 4/3

7:00 a.m.-9:10 p.m.

1 stop11h 10m

C$ 361

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 15/2

5:10 p.m.-10:24 p.m.

1 stop8h 14m

Seattle/Tacoma Intl

Fri 20/2

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

1 stop9h 55m

C$ 361

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 28/1

8:00 a.m.-11:09 a.m.

Nonstop6h 09m

Seattle/Tacoma Intl

Sun 1/2

7:15 a.m.-9:00 p.m.

1 stop10h 45m

C$ 376

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 11/12

8:59 a.m.-5:27 p.m.

1 stop11h 28m

Seattle/Tacoma Intl

Wed 17/12

7:20 a.m.-9:02 p.m.

1 stop10h 42m

C$ 388

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 9/12

9:59 a.m.-5:28 p.m.

1 stop10h 29m

Seattle/Tacoma Intl

Wed 17/12

7:20 a.m.-9:02 p.m.

1 stop10h 42m

C$ 388

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 21/2

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

Seattle/Tacoma Intl

Wed 25/2

9:55 a.m.-9:10 p.m.

1 stop8h 15m

C$ 389

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 12/12

8:59 a.m.-5:27 p.m.

1 stop11h 28m

Seattle/Tacoma Intl

Sat 13/12

8:00 a.m.-4:08 p.m.

Nonstop5h 08m

C$ 402

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 18 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 24 October 2025.

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$ 197). Flying from Washington, D.C. Reagan-National Airport to Seattle in January is currently the most expensive (average of C$ 386). 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 27 October 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 5h 55m. Fly via Alaska Airlines or Hawaiian 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: Finnair (100%), Alaska Airlines (93%), Hawaiian Airlines( 93%).

  • 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$ 251, our data indicates the cheapest price to be C$ 251. The most popular route (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), is priced around C$ 711.

  • 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$ 197). Flying from Washington, D.C. Reagan-National Airport to Seattle in January is currently the most expensive (average of C$ 386). 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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