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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from C$ 179

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — SEA
11 Jan — 18 Jan1
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 12 December 2025.

Thu 25/1211:25 a.m.DCA - SEA
2 stops10h 15mSouthwest
Mon 5/16:35 a.m.SEA - DCA
1 stop8h 00mSouthwest
Deal found 10/12C$ 589
Wed 31/124:35 p.m.DCA - SEA
1 stop8h 55mSouthwest
Mon 5/16:35 a.m.SEA - DCA
1 stop8h 00mSouthwest
Deal found 10/12C$ 601
Wed 31/125:59 p.m.DCA - SEA
1 stop10h 00mUnited Airlines
Sat 10/17:00 a.m.SEA - DCA
1 stop6h 59mUnited Airlines
Deal found 10/12C$ 615
Thu 25/124:59 p.m.DCA - SEA
Nonstop5h 55mDelta
Mon 5/17:20 a.m.SEA - DCA
Nonstop5h 00mDelta
Deal found 10/12C$ 679
Wed 31/125:59 p.m.DCA - SEA
1 stop10h 00mUnited Airlines
Sun 4/111:59 p.m.SEA - DCA
1 stop7h 58mUnited Airlines
Deal found 10/12C$ 685
Wed 24/125:11 p.m.DCA - SEA
1 stop9h 16mDelta
Mon 5/17:20 a.m.SEA - DCA
Nonstop5h 00mDelta
Deal found 10/12C$ 692
Thu 25/124:59 p.m.DCA - SEA
Nonstop5h 55mDelta
Thu 1/17:35 a.m.SEA - DCA
Nonstop5h 01mDelta
Deal found 10/12C$ 699
Wed 24/125:00 p.m.DCA - SEA
Nonstop6h 00mAlaska Airlines
Tue 13/17:15 a.m.SEA - DCA
1 stop10h 45mAlaska Airlines
Deal found 11/12C$ 701
Thu 25/126:30 a.m.DCA - SEA
1 stop8h 33mUnited Airlines
Wed 31/125:02 a.m.SEA - DCA
1 stop6h 57mUnited Airlines
Deal found 10/12C$ 706
Wed 24/125:11 p.m.DCA - SEA
1 stop9h 16mDelta
Thu 1/17:35 a.m.SEA - DCA
Nonstop5h 01mDelta
Deal found 10/12C$ 713

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 12 December 2025.

Round-trip from

C$ 301

One-way from

C$ 179

Popular in

June

Cheapest in

September

Average price

C$ 630

Good round-trip deal

C$ 247 or less
Alaska Airlines
  • Alaska Airlines
  • 7/1-12/1
  • 2 total stops
  • 34h 33m total
  • Washington, D.C. to Seattle
Search Deals
United Airlines
  • United Airlines
  • 6/1
  • 1 total stop
  • 10h 44m total
  • Washington, D.C. to Seattle
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 32 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 12 December 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

Tue 3/3

5:06 p.m.-10:18 p.m.

1 stop8h 12m

Seattle/Tacoma Intl

Wed 4/3

7:10 a.m.-9:02 p.m.

1 stop10h 52m

C$ 301

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 12/1

6:56 p.m.-11:21 a.m.

1 stop19h 25m

Seattle/Tacoma Intl

Thu 15/1

7:50 p.m.-4:01 p.m.

1 stop17h 11m

C$ 327

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 12/1

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

Nonstop5h 59m

Seattle/Tacoma Intl

Thu 15/1

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

Nonstop5h 00m

C$ 330

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 6/1

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

Nonstop5h 59m

Seattle/Tacoma Intl

Thu 8/1

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

Nonstop5h 00m

C$ 330

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 9/2

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

Nonstop5h 59m

Seattle/Tacoma Intl

Thu 12/2

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

Nonstop5h 00m

C$ 330

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 15/2

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

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 20/2

12:00 p.m.-11:28 p.m.

1 stop8h 28m

C$ 343

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 21/2

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

Nonstop5h 59m

Seattle/Tacoma Intl

Wed 25/2

11:55 a.m.-11:32 p.m.

1 stop8h 37m

C$ 356

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 5/1

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

Nonstop5h 55m

Seattle/Tacoma Intl

Tue 13/1

1:55 p.m.-9:59 p.m.

Nonstop5h 04m

C$ 370

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 9/2

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

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 13/2

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

Nonstop5h 00m

C$ 370

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 9/1

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

Nonstop5h 59m

Seattle/Tacoma Intl

Sat 10/1

3:59 p.m.-7:19 a.m.

1 stop12h 20m

C$ 390

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

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 5 December 2025.

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, March is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Seattle (average of C$ 194). Flying from Washington, D.C. Reagan-National Airport to Seattle in February is currently the most expensive (average of C$ 370). 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 12 December 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 7 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 7h 37m. Fly via Alaska Airlines 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: Korean Air (89%), Japan Airlines (87%), Alaska Airlines( 83%).

  • 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$ 247, our data indicates the cheapest price to be C$ 247. The most popular route (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), is priced around C$ 1,298.

  • 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$ 194). Flying from Washington, D.C. Reagan-National Airport to Seattle in February is currently the most expensive (average of C$ 370). 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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Leavenworth
SeaTac
Tukwila
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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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