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Cheap flights from Seattle to Washington, D.C. Reagan-National Airport from C$ 251

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 25/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DCA
28 Aug — 4 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Reagan-National

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Reagan-National
Explore the most affordable flight options available from Seattle to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 July 2026.

Mon 21/911:05 p.m.
SEA
-
DCA
1 stop6h 50m
Southwest
Wed 23/912:00 p.m.
DCA
-
SEA
2 stops9h 10m
Southwest
Deal found 28/7C$ 409
Wed 26/89:59 p.m.
SEA
-
DCA
1 stop15h 01m
Alaska Airlines
Sun 6/98:00 a.m.
DCA
-
SEA
Nonstop5h 54m
Alaska Airlines
Deal found 27/7C$ 416
Sat 5/99:40 a.m.
SEA
-
DCA
1 stop9h 10m
Southwest
Sat 12/96:05 a.m.
DCA
-
SEA
2 stops16h 30m
Southwest
Deal found 27/7C$ 418
Tue 15/98:41 a.m.
SEA
-
DCA
1 stop9h 19m
Alaska Airlines
Tue 22/95:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 26/7C$ 423
Fri 4/911:00 p.m.
SEA
-
DCA
1 stop10h 30m
Southwest
Wed 9/96:40 p.m.
DCA
-
SEA
2 stops16h 55m
Southwest
Deal found 26/7C$ 425
Tue 1/98:59 p.m.
SEA
-
DCA
1 stop16h 01m
Alaska Airlines
Tue 8/95:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 26/7C$ 426
Thu 17/911:05 p.m.
SEA
-
DCA
1 stop9h 45m
Southwest
Sat 26/97:00 a.m.
DCA
-
SEA
1 stop8h 55m
Southwest
Deal found 29/7C$ 430
Mon 5/104:27 p.m.
SEA
-
DCA
1 stop26h 32m
Frontier
Mon 12/107:00 a.m.
DCA
-
SEA
1 stop29h 51m
Frontier
Deal found 27/7C$ 436
Wed 26/81:46 p.m.
SEA
-
DCA
Nonstop5h 13m
Alaska Airlines
Mon 31/85:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 27/7C$ 437
Tue 6/1011:41 p.m.
SEA
-
DCA
1 stop9h 36m
JetBlue
Sat 17/1012:20 p.m.
DCA
-
SEA
1 stop13h 18m
JetBlue
Deal found 28/7C$ 442
Thu 27/86:51 p.m.
SEA
-
DCA
1 stop18h 09m
Alaska Airlines
Mon 31/85:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 29/7C$ 444

Find flight deals from Seattle to Reagan-National

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Reagan-National (DCA). 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 29 July 2026.

Round-trip from

C$ 409

One-way from

C$ 251

Popular in

November

Cheapest in

January

Average price

C$ 705
Southwest
  • Southwest
  • 21/9-23/9
  • 3 total stops
  • 16h 00m total
  • Seattle to Washington, D.C.
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 25/8
  • 1 total stop
  • 10h 20m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Reagan-National 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 29 July 2026.
Use the filters below to find and compare flights from Seattle to Washington, D.C. Reagan-National Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 5/9

9:40 a.m.-9:50 p.m.

1 stop9h 10m

Washington, D.C. Reagan-National

Sat 12/9

6:05 a.m.-7:35 p.m.

2 stops16h 30m

C$ 418

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 27/8

8:00 a.m.-4:20 p.m.

Nonstop5h 20m

Washington, D.C. Reagan-National

Mon 31/8

5:00 p.m.-7:51 p.m.

Nonstop5h 51m

C$ 437

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 2/9

5:20 a.m.-3:45 p.m.

1 stop7h 25m

Washington, D.C. Reagan-National

Wed 2/9

6:40 p.m.-11:35 p.m.

1 stop7h 55m

C$ 459

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 25/8

11:00 p.m.-12:05 p.m.

1 stop10h 05m

Washington, D.C. Reagan-National

Sat 29/8

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

2 stops11h 15m

C$ 466

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 6/10

1:49 p.m.-9:59 p.m.

Nonstop5h 10m

Washington, D.C. Reagan-National

Tue 13/10

10:59 a.m.-6:02 p.m.

1 stop10h 03m

C$ 518

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 30/10

5:50 a.m.-7:50 p.m.

2 stops11h 00m

Washington, D.C. Reagan-National

Sun 1/11

6:30 p.m.-12:40 a.m.

1 stop9h 10m

C$ 539

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 11/9

5:15 a.m.-2:50 p.m.

1 stop6h 35m

Washington, D.C. Reagan-National

Fri 18/9

6:40 p.m.-8:35 a.m.

2 stops16h 55m

C$ 553

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 6/9

5:25 a.m.-4:35 p.m.

1 stop8h 10m

Washington, D.C. Reagan-National

Wed 9/9

6:40 p.m.-8:35 a.m.

2 stops16h 55m

C$ 553

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 6/10

6:15 a.m.-10:55 p.m.

2 stops13h 40m

Washington, D.C. Reagan-National

Tue 13/10

12:20 p.m.-7:05 p.m.

2 stops9h 45m

C$ 554
Quickest round-trip

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 26/9

7:20 a.m.-3:32 p.m.

Nonstop5h 12m

Washington, D.C. Reagan-National

Wed 30/9

4:45 p.m.-7:25 p.m.

Nonstop5h 40m

C$ 560

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/7

Showing 1-10 of 22 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Reagan-National

Have a flexible travel schedule? Discover the best time to fly to Reagan-National from Seattle 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 Seattle to Washington, D.C. Reagan-National Airport

How far ahead should I book a flight from Seattle to Washington, D.C. Reagan-National Airport?

The best time to book flights from Seattle to Washington, D.C. Reagan-National Airport is 80 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Washington, D.C. Reagan-National Airport?

Currently, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 422). Flying from Seattle to Washington, D.C. Reagan-National Airport in November is currently the most expensive (average of C$ 752). 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 SEA to DCA?

Find hourly flight availability from Seattle to Reagan-National. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 July 2026.

When flying from Seattle to Washington, D.C. Reagan-National Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Seattle to Washington, D.C. Reagan-National Airport?

Airfare is below average for this route at the moment.

Seattle to Washington, D.C. Reagan-National Airport flights typically cost between C$ 491 and C$ 895 in September.
The cheapest round-trip price found within the last 5 days was C$ 409 on Southwest (21 Sep-23 Sep).

Related info for your journey

Find useful and relevant information for your journey from Seattle to Reagan-National. 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 from for flights from Seattle to Washington, D.C. Reagan-National?

    If you book a flight to Washington, D.C. Reagan-National from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 18.4 km from the centre of Seattle. There are 3 flights from Seattle/Tacoma Intl to Washington, D.C. Reagan-National per day from 0 different airlines.

  • How long is the flight from Seattle to Washington, D.C. Reagan-National Airport?

    For as low as C$ 437, Southwest can have you in Washington, D.C. Reagan-National Airport from Seattle in 5h 20m. There are 3735 km between Seattle and Washington, D.C. Reagan-National Airport. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most reliable airlines from Seattle to Washington, D.C. Reagan-National Airport?

    No one likes to see their flight delayed. When booking a flight from Seattle to Washington, D.C. Reagan-National Airport consider choosing Delta (95%), Japan Airlines (58%) or Alaska Airlines (49%) as they are the most reliable in getting you off to your destination on time.

  • Can I find deals for flights from Seattle to Reagan-National that include hotel bookings?

    Yes. In addition to deals on Seattle to Reagan-National flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Reagan-National?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Reagan-National.

  • Can I find deals for business class flights from Seattle to Reagan-National?

    Yes. Cheapflights offers flight deals from Seattle to Reagan-National 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 Seattle to Washington, D.C. Reagan-National Airport?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 422). Flying from Seattle to Washington, D.C. Reagan-National Airport in November is currently the most expensive (average of C$ 752). 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 Washington, D.C. Reagan-National Airport?

Book flights to Washington, D.C. Reagan-National Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Gaithersburg
Reston
Herndon
Ellicott City
Arlington
Fredericksburg
Alexandria
Rockville

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Reagan-National

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Dulles Intl flights

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How does Cheapflights help users find flights from Seattle to Reagan-National?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Reagan-National. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Reagan-National?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Reagan-National.

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Yes! Cheapflights helps users easily find flights from Seattle to Reagan-National with no change fees.

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Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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