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Cheap flights from Seattle to Washington, D.C. Reagan-National Airport from C$ 179

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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DCA
11 Jan — 18 Jan1
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 12 December 2025.

Tue 30/122:54 p.m.SEA - DCA
1 stop28h 05mFrontier
Sun 4/16:00 p.m.DCA - SEA
1 stop21h 30mFrontier
Deal found 9/12C$ 404
Wed 31/127:35 a.m.SEA - DCA
Nonstop5h 01mDelta
Mon 5/14:44 p.m.DCA - SEA
Nonstop5h 59mDelta
Deal found 10/12C$ 506
Thu 25/129:35 a.m.SEA - DCA
2 stops10h 15mSouthwest
Thu 8/14:05 p.m.DCA - SEA
1 stop9h 30mSouthwest
Deal found 10/12C$ 549
Wed 31/1211:09 p.m.SEA - DCA
1 stop10h 15mUnited Airlines
Mon 5/16:00 p.m.DCA - SEA
1 stop7h 47mUnited Airlines
Deal found 10/12C$ 554
Fri 26/1211:59 p.m.SEA - DCA
1 stop7h 00mUnited Airlines
Mon 5/13:30 p.m.DCA - SEA
1 stop10h 17mUnited Airlines
Deal found 10/12C$ 630
Thu 25/127:10 a.m.SEA - DCA
1 stop11h 20mDelta
Mon 5/14:44 p.m.DCA - SEA
Nonstop5h 59mDelta
Deal found 9/12C$ 634
Thu 25/127:35 a.m.SEA - DCA
Nonstop5h 01mDelta
Thu 8/14:44 p.m.DCA - SEA
Nonstop5h 59mDelta
Deal found 10/12C$ 639
Mon 15/123:40 p.m.SEA - DCA
1 stop18h 26mFrontier
Mon 22/126:00 p.m.DCA - SEA
1 stop21h 30mFrontier
Deal found 11/12C$ 656
Wed 24/121:55 p.m.SEA - DCA
Nonstop5h 04mAlaska Airlines
Mon 5/15:00 p.m.DCA - SEA
Nonstop6h 00mAlaska Airlines
Deal found 9/12C$ 665
Wed 24/123:55 p.m.SEA - DCA
1 stop16h 42mDelta
Mon 5/14:44 p.m.DCA - SEA
Nonstop5h 59mDelta
Deal found 9/12C$ 670

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 12 December 2025.

Round-trip from

C$ 301

One-way from

C$ 179

Popular in

March

Cheapest in

September

Average price

C$ 548
Alaska Airlines
  • Alaska Airlines
  • 31/1-3/2
  • 2 total stops
  • 19h 49m total
  • Seattle to Washington, D.C.
Search Deals
Delta
  • Delta
  • 8/2
  • 1 total stop
  • 9h 50m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 44 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 12 December 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

Sat 31/1

6:00 a.m.-5:56 p.m.

1 stop8h 56m

Washington, D.C. Reagan-National

Tue 3/2

9:59 a.m.-5:52 p.m.

1 stop10h 53m

C$ 301

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 22/1

11:10 p.m.-8:53 a.m.

1 stop6h 43m

Washington, D.C. Reagan-National

Mon 26/1

3:43 p.m.-11:15 p.m.

1 stop10h 32m

C$ 302

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 14/1

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Thu 15/1

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

Nonstop5h 59m

C$ 330

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 19/2

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

Nonstop5h 00m

Washington, D.C. Reagan-National

Sun 22/2

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

Nonstop5h 59m

C$ 342

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 18/3

7:25 a.m.-3:23 p.m.

Nonstop4h 58m

Washington, D.C. Reagan-National

Tue 24/3

4:45 p.m.-7:39 p.m.

Nonstop5h 54m

C$ 342

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 15/1

5:00 a.m.-2:59 p.m.

1 stop6h 59m

Washington, D.C. Reagan-National

Mon 19/1

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

1 stop8h 02m

C$ 354

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 11/3

6:00 a.m.-5:59 p.m.

1 stop8h 59m

Washington, D.C. Reagan-National

Sat 14/3

4:45 p.m.-7:37 p.m.

Nonstop5h 52m

C$ 356

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 10/1

11:10 p.m.-8:53 a.m.

1 stop6h 43m

Washington, D.C. Reagan-National

Mon 12/1

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

Nonstop5h 59m

C$ 356

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

Mon 26/1

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

1 stop8h 02m

C$ 361

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 21/1

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

2 stops10h 12m

Washington, D.C. Reagan-National

Mon 26/1

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

1 stop8h 02m

C$ 361

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 20 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 5 December 2025.

The best time to book flights from Seattle to Washington, D.C. Reagan-National Airport is 59 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$ 205). Flying from Seattle to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of C$ 396). 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 12 December 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 62% 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$ 302, Alaska Airlines can have you in Washington, D.C. Reagan-National Airport from Seattle in 6h 43m. 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 (92%), Alaska Airlines (80%) or Hawaiian Airlines (80%) 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$ 205). Flying from Seattle to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of C$ 396). 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

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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