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Cheap flights from Seattle to Washington, D.C. Reagan-National Airport from C$ 189

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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DCA
30 May — 6 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. Reagan-National are usually found in January or February, booked 81 days in advance, depart on a Monday or Tuesday and return on a Monday

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 30 April 2026.

Wed 9/910:54 a.m.
SEA
-
DCA
1 stop7h 59m
United Airlines
Mon 14/96:00 p.m.
DCA
-
SEA
1 stop7h 42m
United Airlines
Deal found 27/4C$ 363
Wed 5/811:00 p.m.
SEA
-
DCA
1 stop13h 50m
Southwest
Sun 9/85:35 p.m.
DCA
-
SEA
1 stop10h 15m
Southwest
Deal found 28/4C$ 369
Wed 13/57:50 p.m.
SEA
-
DCA
1 stop14h 09m
Frontier
Mon 18/56:00 p.m.
DCA
-
SEA
1 stop18h 49m
Frontier
Deal found 26/4C$ 394
Tue 11/811:56 p.m.
SEA
-
DCA
1 stop8h 29m
United Airlines
Mon 17/82:00 p.m.
DCA
-
SEA
1 stop7h 59m
United Airlines
Deal found 29/4C$ 398
Sat 15/811:56 p.m.
SEA
-
DCA
1 stop8h 29m
United Airlines
Sat 22/86:00 p.m.
DCA
-
SEA
1 stop7h 42m
United Airlines
Deal found 27/4C$ 402
Fri 5/67:20 a.m.
SEA
-
DCA
Nonstop5h 08m
Delta
Tue 9/64:36 p.m.
DCA
-
SEA
Nonstop5h 54m
Delta
Deal found 28/4C$ 404
Thu 24/910:40 p.m.
SEA
-
DCA
1 stop7h 35m
United Airlines
Sun 27/97:00 p.m.
DCA
-
SEA
1 stop8h 14m
United Airlines
Deal found 27/4C$ 406
Tue 15/910:47 p.m.
SEA
-
DCA
1 stop8h 30m
United Airlines
Thu 24/97:00 p.m.
DCA
-
SEA
1 stop8h 14m
United Airlines
Deal found 28/4C$ 415
Fri 7/85:15 a.m.
SEA
-
DCA
1 stop6h 35m
Southwest
Sun 9/85:35 p.m.
DCA
-
SEA
1 stop10h 15m
Southwest
Deal found 28/4C$ 417
Sat 5/910:54 a.m.
SEA
-
DCA
1 stop7h 59m
United Airlines
Mon 7/95:00 p.m.
DCA
-
SEA
1 stop8h 42m
United Airlines
Deal found 28/4C$ 419
Thu 17/911:56 p.m.
SEA
-
DCA
1 stop8h 29m
United Airlines
Sun 20/96:30 a.m.
DCA
-
SEA
1 stop7h 47m
United Airlines
Deal found 29/4C$ 420
Fri 18/910:47 p.m.
SEA
-
DCA
1 stop7h 28m
United Airlines
Sun 20/96:30 a.m.
DCA
-
SEA
1 stop7h 47m
United Airlines
Deal found 28/4C$ 421

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 30 April 2026.

Round-trip from

C$ 363

One-way from

C$ 189

Popular in

November

Cheapest in

January

Average price

C$ 625
United Airlines
  • United Airlines
  • 9/9-14/9
  • 2 total stops
  • 15h 41m total
  • Seattle to Washington, D.C.
Search Deals
Southwest
  • Southwest
  • 22/8
  • 1 total stop
  • 10h 45m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 30 April 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

Thu 23/7

10:45 p.m.-8:25 a.m.

1 stop6h 40m

Washington, D.C. Reagan-National

Tue 28/7

1:00 p.m.-8:10 p.m.

1 stop10h 10m

C$ 363

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/6

11:05 p.m.-8:45 a.m.

1 stop6h 40m

Washington, D.C. Reagan-National

Mon 8/6

6:55 p.m.-12:30 a.m.

1 stop8h 35m

C$ 363

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/6

11:45 a.m.-11:00 p.m.

1 stop8h 15m

Washington, D.C. Reagan-National

Tue 9/6

4:55 p.m.-12:40 a.m.

2 stops10h 45m

C$ 458

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 11/6

11:05 a.m.-11:55 p.m.

1 stop9h 50m

Washington, D.C. Reagan-National

Sun 14/6

1:10 p.m.-12:50 a.m.

2 stops14h 40m

C$ 499
Quickest round-trip

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 5/6

7:20 a.m.-3:28 p.m.

Nonstop5h 08m

Washington, D.C. Reagan-National

Tue 9/6

4:36 p.m.-7:30 p.m.

Nonstop5h 54m

C$ 501

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 10/6

7:20 a.m.-3:26 p.m.

Nonstop5h 06m

Washington, D.C. Reagan-National

Mon 15/6

5:50 p.m.-11:59 p.m.

1 stop9h 09m

C$ 554

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/6

7:20 a.m.-3:28 p.m.

Nonstop5h 08m

Washington, D.C. Reagan-National

Mon 8/6

5:00 p.m.-11:08 p.m.

1 stop9h 08m

C$ 554

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 8/7

7:20 a.m.-3:21 p.m.

Nonstop5h 01m

Washington, D.C. Reagan-National

Mon 13/7

5:29 p.m.-10:33 p.m.

1 stop8h 04m

C$ 554

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 9/6

6:15 a.m.-8:50 p.m.

2 stops11h 35m

Washington, D.C. Reagan-National

Tue 16/6

4:55 p.m.-12:40 a.m.

2 stops10h 45m

C$ 554

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 1/8

7:45 p.m.-8:45 a.m.

2 stops10h 00m

Washington, D.C. Reagan-National

Thu 3/9

6:40 p.m.-11:30 p.m.

1 stop7h 50m

C$ 569

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/4

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$ 368). Flying from Seattle to Washington, D.C. Reagan-National Airport in November is currently the most expensive (average of C$ 698). 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 30 April 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?

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$ 554, Southwest can have you in Washington, D.C. Reagan-National Airport from Seattle in 5h 06m. 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 (94%), Alaska Airlines (77%) or Hawaiian Airlines (77%) 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$ 368). Flying from Seattle to Washington, D.C. Reagan-National Airport in November is currently the most expensive (average of C$ 698). 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
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Arlington
Herndon
Manassas
Fredericksburg
Alexandria
Rockville

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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.

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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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