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Cheap flights from Seattle to Washington, D.C. Reagan-National Airport from C$ 211

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 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DCA
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 11 September 2025.

Round-trip from

C$ 356

One-way from

C$ 211

Popular in

December

Cheapest in

November

Average price

C$ 564

Good round-trip deal

C$ 206 or less

Good one-way deal

C$ 588 or less
Hawaiian Airlines
  • Hawaiian Airlines
  • 8/1-20/1
  • Nonstop
  • 11h 05m total
  • Seattle to Washington, D.C.
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Southwest
  • Southwest
  • 12/12
  • 1 total stop
  • 7h 55m total
  • Seattle to Washington, D.C.
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Highest demand for flights based on searches. 6% potential increase in price (C$ 59 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 32 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. Reagan-National.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. Reagan-National.
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Find flight deals from Seattle to Reagan-National

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 11 September 2025.

Tue 28/101:52 p.m.SEA - DCA
Nonstop5h 07mAlaska Airlines
Sat 1/115:00 p.m.DCA - SEA
Nonstop6h 03mAlaska Airlines
Deal found 10/9C$ 356
Wed 22/109:10 a.m.SEA - DCA
1 stop8h 25mSouthwest
Tue 28/1011:45 a.m.DCA - SEA
2 stops11h 05mSouthwest
Deal found 11/9C$ 358
Thu 20/116:35 a.m.SEA - DCA
1 stop8h 40mSouthwest
Sun 23/113:10 p.m.DCA - SEA
1 stop7h 50mSouthwest
Deal found 9/9C$ 364
Thu 30/105:20 a.m.SEA - DCA
1 stop7h 40mHawaiian Airlines
Sat 1/115:00 p.m.DCA - SEA
Nonstop6h 03mHawaiian Airlines
Deal found 10/9C$ 370
Wed 5/115:40 a.m.SEA - DCA
2 stops11h 50mSouthwest
Sat 8/116:05 a.m.DCA - SEA
1 stop8h 05mSouthwest
Deal found 9/9C$ 371
Wed 8/1010:50 a.m.SEA - DCA
1 stop7h 13mUnited Airlines
Wed 15/105:00 p.m.DCA - SEA
1 stop8h 30mUnited Airlines
Deal found 10/9C$ 377
Mon 8/127:20 a.m.SEA - DCA
1 stop10h 42mHawaiian Airlines
Wed 10/128:59 a.m.DCA - SEA
1 stop11h 22mHawaiian Airlines
Deal found 10/9C$ 382
Wed 3/1210:40 a.m.SEA - DCA
1 stop7h 15mUnited Airlines
Sun 7/126:30 a.m.DCA - SEA
1 stop8h 17mUnited Airlines
Deal found 10/9C$ 384
Mon 27/105:15 a.m.SEA - DCA
1 stop6h 45mSouthwest
Wed 29/1011:45 a.m.DCA - SEA
2 stops11h 05mSouthwest
Deal found 10/9C$ 385
Thu 4/125:40 a.m.SEA - DCA
2 stops9h 35mSouthwest
Sun 7/123:10 p.m.DCA - SEA
1 stop7h 50mSouthwest
Deal found 10/9C$ 388
Mon 8/125:40 a.m.SEA - DCA
2 stops9h 35mSouthwest
Wed 10/124:40 p.m.DCA - SEA
2 stops9h 15mSouthwest
Deal found 9/9C$ 396
Wed 29/105:20 a.m.SEA - DCA
1 stop7h 40mAlaska Airlines
Sat 1/118:00 a.m.DCA - SEA
Nonstop6h 03mAlaska Airlines
Deal found 10/9C$ 398

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 11 September 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

Mon 5/1

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

Nonstop5h 04m

Washington, D.C. Reagan-National

Thu 22/1

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 27/11

8:00 a.m.-4:06 p.m.

Nonstop5h 06m

Washington, D.C. Reagan-National

Thu 4/12

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/1

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

Nonstop5h 10m

Washington, D.C. Reagan-National

Wed 21/1

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 8/1

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

Nonstop5h 10m

Washington, D.C. Reagan-National

Sun 18/1

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 6/1

8:00 a.m.-4:07 p.m.

Nonstop5h 07m

Washington, D.C. Reagan-National

Thu 22/1

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

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 8/1

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

Nonstop5h 10m

Washington, D.C. Reagan-National

Wed 21/1

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 7/1

8:00 a.m.-4:15 p.m.

Nonstop5h 15m

Washington, D.C. Reagan-National

Tue 20/1

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/1

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

Nonstop5h 10m

Washington, D.C. Reagan-National

Thu 22/1

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 3/12

1:56 p.m.-9:59 p.m.

Nonstop5h 03m

Washington, D.C. Reagan-National

Sun 7/12

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 384

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 3/12

1:56 p.m.-9:59 p.m.

Nonstop5h 03m

Washington, D.C. Reagan-National

Sat 6/12

8:00 a.m.-10:55 a.m.

Nonstop5h 55m

C$ 384

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/9

Showing 1-10 of 20 results
1
2

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 29 August 2025.

The best time to book flights from Seattle to Washington, D.C. Reagan-National Airport is 43 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, March is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 263). Flying from Seattle to Washington, D.C. Reagan-National Airport in August is currently the most expensive (average of C$ 332). 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 11 September 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 morning. If you’re flexible enough to do this you can expect to save up to 19% 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 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$ 356, 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. Most flights are nonstop.

  • 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 (62%) or Hawaiian Airlines (62%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Seattle to Washington, D.C. Reagan-National Airport?

    Looking at all options, your cheapest flight can be booked for C$ 206. While the most popular route (Seattle/Tacoma Intl - Washington, D.C. Reagan-National) can be booked for C$ 265 on average, our data indicates C$ 398 when flying from Seattle to Washington, D.C. Reagan-National Airport.

  • 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, March is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Reagan-National Airport (average of C$ 263). Flying from Seattle to Washington, D.C. Reagan-National Airport in August is currently the most expensive (average of C$ 332). 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
Herndon
Hanover
Reston
Fairfax
Ellicott City
Oxon Hill
Gaithersburg
Arlington
Alexandria
Manassas
Fredericksburg
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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