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Cheap flights from Seattle to Washington, D.C. Reagan-National Airport from C$ 175

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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DCA
28 Feb — 7 Mar1
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 January 2026.

Wed 18/21:56 p.m.
SEA
-
DCA
Nonstop5h 03m
Alaska Airlines
Tue 24/28:00 a.m.
DCA
-
SEA
Nonstop5h 55m
Alaska Airlines
Deal found 27/1C$ 322
Tue 17/37:10 a.m.
SEA
-
DCA
1 stop10h 52m
Hawaiian Airlines
Tue 24/35:00 p.m.
DCA
-
SEA
Nonstop6h 02m
Hawaiian Airlines
Deal found 26/1C$ 327
Tue 31/31:53 p.m.
SEA
-
DCA
Nonstop5h 06m
Alaska Airlines
Tue 7/48:00 a.m.
DCA
-
SEA
Nonstop6h 05m
Alaska Airlines
Deal found 27/1C$ 335
Sat 28/27:00 a.m.
SEA
-
DCA
1 stop6h 59m
United Airlines
Fri 6/31:00 p.m.
DCA
-
SEA
1 stop9h 03m
United Airlines
Deal found 28/1C$ 349
Fri 17/41:53 p.m.
SEA
-
DCA
Nonstop5h 06m
Alaska Airlines
Tue 28/48:00 a.m.
DCA
-
SEA
Nonstop5h 57m
Alaska Airlines
Deal found 28/1C$ 356
Wed 15/41:53 p.m.
SEA
-
DCA
Nonstop5h 06m
Alaska Airlines
Tue 28/48:59 a.m.
DCA
-
SEA
1 stop11h 33m
Alaska Airlines
Deal found 28/1C$ 362
Tue 24/29:00 a.m.
SEA
-
DCA
2 stops9h 59m
United Airlines
Tue 3/36:00 p.m.
DCA
-
SEA
1 stop7h 43m
United Airlines
Deal found 26/1C$ 386
Sat 21/27:20 a.m.
SEA
-
DCA
Nonstop5h 00m
Delta
Sat 28/24:44 p.m.
DCA
-
SEA
Nonstop5h 59m
Delta
Deal found 27/1C$ 390
Wed 25/29:55 a.m.
SEA
-
DCA
2 stops9h 05m
Southwest
Wed 4/36:00 a.m.
DCA
-
SEA
1 stop10h 15m
Southwest
Deal found 27/1C$ 396
Sun 1/311:59 p.m.
SEA
-
DCA
1 stop9h 00m
United Airlines
Mon 2/36:00 p.m.
DCA
-
SEA
1 stop8h 51m
United Airlines
Deal found 27/1C$ 398
Wed 20/57:00 a.m.
SEA
-
DCA
1 stop7h 04m
United Airlines
Sat 23/55:49 p.m.
DCA
-
SEA
1 stop8h 32m
United Airlines
Deal found 27/1C$ 400
Sun 1/37:25 a.m.
SEA
-
DCA
1 stop9h 00m
Southwest
Tue 3/36:00 a.m.
DCA
-
SEA
1 stop10h 15m
Southwest
Deal found 27/1C$ 402

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 January 2026.

Round-trip from

C$ 322

One-way from

C$ 175

Popular in

November

Cheapest in

January

Average price

C$ 498
Alaska Airlines
  • Alaska Airlines
  • 18/2-24/2
  • Nonstop
  • 10h 58m total
  • Seattle to Washington, D.C.
Search Deals
Southwest
  • Southwest
  • 18/2
  • 1 total stop
  • 8h 35m total
  • Seattle to Washington, D.C.
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 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

Seattle

Fly to

Reagan-National

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 15/4

1:53 p.m.-9:59 p.m.

Nonstop5h 06m

Washington, D.C. Reagan-National

Tue 28/4

8:00 a.m.-10:57 a.m.

Nonstop5h 57m

C$ 322

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 18/2

9:19 a.m.-9:39 p.m.

1 stop9h 20m

Washington, D.C. Reagan-National

Wed 25/2

2:00 p.m.-7:03 p.m.

1 stop8h 03m

C$ 349

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 18/3

1:53 p.m.-9:59 p.m.

Nonstop5h 06m

Washington, D.C. Reagan-National

Tue 24/3

5:00 p.m.-8:02 p.m.

Nonstop6h 02m

C$ 349

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 24/2

11:59 p.m.-11:59 a.m.

1 stop9h 00m

Washington, D.C. Reagan-National

Tue 3/3

2:00 p.m.-7:03 p.m.

1 stop8h 03m

C$ 349

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 16/4

7:30 a.m.-3:27 p.m.

Nonstop4h 57m

Washington, D.C. Reagan-National

Tue 28/4

4:39 p.m.-7:30 p.m.

Nonstop5h 51m

C$ 390

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 21/2

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Sat 28/2

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

Nonstop5h 59m

C$ 390

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 17/4

1:53 p.m.-9:59 p.m.

Nonstop5h 06m

Washington, D.C. Reagan-National

Tue 28/4

8:59 a.m.-4:10 p.m.

1 stop10h 11m

C$ 396

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 4/3

9:55 a.m.-11:20 p.m.

2 stops10h 25m

Washington, D.C. Reagan-National

Fri 6/3

3:20 p.m.-12:30 a.m.

1 stop12h 10m

C$ 417

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 31/3

11:59 p.m.-10:59 a.m.

1 stop8h 00m

Washington, D.C. Reagan-National

Mon 13/4

1:00 p.m.-7:00 p.m.

1 stop9h 00m

C$ 424

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 23/4

7:30 a.m.-3:27 p.m.

Nonstop4h 57m

Washington, D.C. Reagan-National

Mon 27/4

7:33 p.m.-8:30 a.m.

1 stop15h 57m

C$ 437

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/1

Showing 1-10 of 22 results
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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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Reagan-National. Price data was last updated on 23 January 2026.

The best time to book flights from Seattle to Washington, D.C. Reagan-National Airport is 37 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, July is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 202). Flying from Seattle to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of C$ 284). 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 January 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.

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 9 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$ 390, Alaska Airlines can have you in Washington, D.C. Reagan-National Airport from Seattle in 4h 57m. 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 (87%), Alaska Airlines (86%) or Hawaiian Airlines (86%) 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, July is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 202). Flying from Seattle to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of C$ 284). 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

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

Fly with Cheapflights

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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.

Can Cheapflights find flights from Seattle to Reagan-National with no change fees?

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

Can Cheapflights notify me if prices for flights from Seattle to Reagan-National become cheaper?

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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