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Cheap flights from Seattle to Washington, D.C. Reagan-National Airport from C$ 206

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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DCA
10 Jul — 17 Jul1
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 10 June 2026.

Sat 5/98:48 a.m.
SEA
-
DCA
1 stop9h 12m
Alaska Airlines
Tue 15/95:00 p.m.
DCA
-
SEA
Nonstop5h 51m
Alaska Airlines
Deal found 7/6C$ 411
Mon 31/811:00 p.m.
SEA
-
DCA
1 stop6h 55m
United Airlines
Sat 5/95:10 p.m.
DCA
-
SEA
1 stop8h 33m
United Airlines
Deal found 9/6C$ 413
Thu 6/81:46 p.m.
SEA
-
DCA
Nonstop5h 13m
Alaska Airlines
Tue 11/88:00 a.m.
DCA
-
SEA
Nonstop5h 58m
Alaska Airlines
Deal found 9/6C$ 418
Wed 16/97:20 a.m.
SEA
-
DCA
Nonstop5h 12m
Delta
Sun 20/94:45 p.m.
DCA
-
SEA
Nonstop5h 40m
Delta
Deal found 10/6C$ 425
Wed 1/711:05 p.m.
SEA
-
DCA
1 stop6h 40m
Southwest
Wed 8/74:25 p.m.
DCA
-
SEA
2 stops11h 10m
Southwest
Deal found 5/6C$ 432
Wed 8/711:44 p.m.
SEA
-
DCA
1 stop11h 50m
JetBlue
Tue 14/71:25 p.m.
DCA
-
SEA
1 stop12h 29m
JetBlue
Deal found 7/6C$ 434
Fri 14/87:20 a.m.
SEA
-
DCA
Nonstop5h 01m
Delta
Wed 19/84:35 p.m.
DCA
-
SEA
Nonstop6h 06m
Delta
Deal found 5/6C$ 439
Tue 11/811:00 p.m.
SEA
-
DCA
1 stop10h 05m
Southwest
Sat 22/86:05 a.m.
DCA
-
SEA
2 stops16h 25m
Southwest
Deal found 7/6C$ 441
Tue 25/811:05 p.m.
SEA
-
DCA
1 stop6h 50m
Southwest
Thu 3/94:35 p.m.
DCA
-
SEA
1 stop10h 45m
Southwest
Deal found 9/6C$ 445
Tue 14/711:05 p.m.
SEA
-
DCA
1 stop6h 20m
Southwest
Wed 22/74:55 p.m.
DCA
-
SEA
2 stops10h 50m
Southwest
Deal found 9/6C$ 446
Tue 4/811:05 p.m.
SEA
-
DCA
1 stop6h 50m
Southwest
Mon 17/84:30 p.m.
DCA
-
SEA
2 stops9h 25m
Southwest
Deal found 9/6C$ 452

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 10 June 2026.

Round-trip from

C$ 411

One-way from

C$ 206

Popular in

November

Cheapest in

January

Average price

C$ 724
Alaska Airlines
  • Alaska Airlines
  • 5/9-15/9
  • 1 total stop
  • 15h 03m total
  • Seattle to Washington, D.C.
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 3/7
  • Nonstop
  • 5h 13m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 10 June 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 3/9

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

Nonstop5h 01m

Washington, D.C. Reagan-National

Sun 6/9

4:35 p.m.-7:41 p.m.

Nonstop6h 06m

C$ 425

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 27/8

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

Nonstop5h 01m

Washington, D.C. Reagan-National

Mon 31/8

4:35 p.m.-7:41 p.m.

Nonstop6h 06m

C$ 425

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 10/9

7:23 a.m.-3:40 p.m.

Nonstop5h 17m

Washington, D.C. Reagan-National

Tue 15/9

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

Nonstop5h 40m

C$ 425

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 9/9

5:20 a.m.-6:25 p.m.

2 stops10h 05m

Washington, D.C. Reagan-National

Mon 14/9

1:00 p.m.-6:20 p.m.

1 stop8h 20m

C$ 432
Quickest round-trip

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 16/9

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

Nonstop5h 12m

Washington, D.C. Reagan-National

Mon 21/9

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

Nonstop5h 40m

C$ 439

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 1/8

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

Nonstop5h 01m

Washington, D.C. Reagan-National

Wed 12/8

4:35 p.m.-7:41 p.m.

Nonstop6h 06m

C$ 489

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 3/9

8:48 a.m.-9:00 p.m.

1 stop9h 12m

Washington, D.C. Reagan-National

Sun 6/9

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

Nonstop5h 51m

C$ 495

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 17/7

6:15 a.m.-8:55 p.m.

2 stops11h 40m

Washington, D.C. Reagan-National

Tue 21/7

4:25 p.m.-12:35 a.m.

2 stops11h 10m

C$ 545

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 19/8

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

Nonstop5h 01m

Washington, D.C. Reagan-National

Tue 25/8

4:35 p.m.-7:41 p.m.

Nonstop6h 06m

C$ 545
Cheapest one-way
Quickest one-way

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 5/9

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

Nonstop5h 01m

C$ 241

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/6

Showing 1-10 of 21 resultsSorted by cheapest first
1
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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$ 375). Flying from Seattle to Washington, D.C. Reagan-National Airport in November is currently the most expensive (average of C$ 738). 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 10 June 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 is 1 flight 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$ 425, Alaska Airlines can have you in Washington, D.C. Reagan-National Airport from Seattle in 5h 12m. 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 (98%), Korean Air (93%) or Hawaiian Airlines (93%) 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$ 375). Flying from Seattle to Washington, D.C. Reagan-National Airport in November is currently the most expensive (average of C$ 738). 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
Fredericksburg
Alexandria
Rockville

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Alternative routes for Seattle to Reagan-National

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

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