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Cheap flights from Seattle to Washington, D.C. Reagan-National Airport from C$ 196

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 24/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DCA
28 Nov — 5 Dec1
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 September or November, booked 17 days in advance, depart on a Monday or Tuesday and return on a Monday

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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 October 2025.

Wed 3/127:20 a.m.SEA - DCA
1 stop10h 42mAlaska Airlines
Fri 5/126:59 p.m.DCA - SEA
1 stop17h 53mAlaska Airlines
Deal found 28/10C$ 358
Wed 31/121:55 p.m.SEA - DCA
Nonstop5h 04mAlaska Airlines
Tue 20/15:01 p.m.DCA - SEA
Nonstop6h 06mAlaska Airlines
Deal found 28/10C$ 359
Thu 25/121:55 p.m.SEA - DCA
Nonstop5h 04mAlaska Airlines
Fri 23/19:59 a.m.DCA - SEA
1 stop10h 53mAlaska Airlines
Deal found 28/10C$ 373
Tue 9/128:05 a.m.SEA - DCA
1 stop8h 55mAlaska Airlines
Thu 11/129:59 a.m.DCA - SEA
1 stop10h 29mAlaska Airlines
Deal found 28/10C$ 386
Wed 3/127:20 a.m.SEA - DCA
1 stop10h 42mAlaska Airlines
Sat 13/128:59 a.m.DCA - SEA
1 stop11h 28mAlaska Airlines
Deal found 26/10C$ 387
Wed 3/127:25 a.m.SEA - DCA
Nonstop5h 02mDelta
Sat 6/124:55 p.m.DCA - SEA
Nonstop5h 53mDelta
Deal found 28/10C$ 401
Sat 6/125:45 a.m.SEA - DCA
1 stop9h 20mSouthwest
Tue 9/124:40 p.m.DCA - SEA
2 stops9h 15mSouthwest
Deal found 29/10C$ 408
Thu 25/127:35 a.m.SEA - DCA
Nonstop5h 01mDelta
Wed 31/125:00 p.m.DCA - SEA
Nonstop5h 55mDelta
Deal found 27/10C$ 415
Fri 5/121:56 p.m.SEA - DCA
Nonstop5h 03mAlaska Airlines
Mon 8/129:59 a.m.DCA - SEA
1 stop29h 31mAlaska Airlines
Deal found 29/10C$ 419
Tue 18/111:52 p.m.SEA - DCA
Nonstop5h 07mAlaska Airlines
Thu 1/18:00 a.m.DCA - SEA
Nonstop6h 04mAlaska Airlines
Deal found 28/10C$ 422
Mon 3/113:01 p.m.SEA - DCA
1 stop27h 58mFrontier
Mon 10/118:15 a.m.DCA - SEA
1 stop30h 52mFrontier
Deal found 28/10C$ 426
Thu 27/117:25 a.m.SEA - DCA
Nonstop5h 00mDelta
Fri 5/124:55 p.m.DCA - SEA
Nonstop5h 53mDelta
Deal found 27/10C$ 429

Cheap 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 October 2025.

Round-trip from

C$ 347

One-way from

C$ 196

Popular in

December

Cheapest in

September

Average price

C$ 562
Alaska Airlines
  • Alaska Airlines
  • 1/2-7/2
  • Nonstop
  • 11h 10m total
  • Seattle to Washington, D.C.
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 24/1
  • Nonstop
  • 5h 09m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 71 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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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 October 2025.
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

Sun 1/2

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

Nonstop5h 04m

Washington, D.C. Reagan-National

Sat 7/2

5:01 p.m.-8:07 p.m.

Nonstop6h 06m

C$ 347

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 7/12

6:35 a.m.-5:35 p.m.

1 stop8h 00m

Washington, D.C. Reagan-National

Mon 8/12

6:00 a.m.-1:25 p.m.

1 stop10h 25m

C$ 359

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 13/2

1:45 p.m.-9:55 p.m.

Nonstop5h 10m

Washington, D.C. Reagan-National

Tue 17/2

5:30 p.m.-8:25 p.m.

Nonstop5h 55m

C$ 359

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop5h 04m

Washington, D.C. Reagan-National

Sun 18/1

5:01 p.m.-8:07 p.m.

Nonstop6h 06m

C$ 359

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 22/1

8:40 a.m.-9:52 p.m.

2 stops10h 12m

Washington, D.C. Reagan-National

Sun 25/1

6:30 a.m.-11:32 a.m.

1 stop8h 02m

C$ 369

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 25/12

8:00 a.m.-4:05 p.m.

Nonstop5h 05m

Washington, D.C. Reagan-National

Sun 18/1

5:09 p.m.-10:33 p.m.

1 stop8h 24m

C$ 373

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 6/12

8:00 a.m.-4:08 p.m.

Nonstop5h 08m

Washington, D.C. Reagan-National

Tue 9/12

9:59 a.m.-6:33 p.m.

1 stop11h 34m

C$ 373

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 25/12

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

Nonstop5h 04m

Washington, D.C. Reagan-National

Thu 22/1

5:09 p.m.-10:33 p.m.

1 stop8h 24m

C$ 373

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 25/12

8:00 a.m.-4:05 p.m.

Nonstop5h 05m

Washington, D.C. Reagan-National

Sat 17/1

5:09 p.m.-10:28 p.m.

1 stop8h 19m

C$ 373

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 9/12

8:00 a.m.-4:08 p.m.

Nonstop5h 08m

Washington, D.C. Reagan-National

Fri 12/12

8:59 a.m.-5:27 p.m.

1 stop11h 28m

C$ 401

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/10

Showing 1-10 of 23 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 24 October 2025.

The best time to book flights from Seattle to Washington, D.C. Reagan-National Airport is 17 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, November is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 184). Flying from Seattle to Washington, D.C. Reagan-National Airport in January is currently the most expensive (average of C$ 419). 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 October 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Washington, D.C. Reagan-National Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 76% on your trip compared to booking a flight at noon.

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 6 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$ 347, Alaska Airlines can have you in Washington, D.C. Reagan-National Airport from Seattle in 5h 04m. 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 (89%), Alaska Airlines (71%) or Hawaiian Airlines (71%) 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, November is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 184). Flying from Seattle to Washington, D.C. Reagan-National Airport in January is currently the most expensive (average of C$ 419). 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
Hanover
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Herndon
Arlington
Manassas
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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