What airlines fly to Washington, D.C. Reagan-National Airport?

Delta, Alaska Airlines and Frontier are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from Seattle according to our data. Delta is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Washington, D.C. Reagan-National Airport. Keep in mind that there are 7 different airlines that fly to Washington, D.C. Reagan-National Airport on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Washington, D.C. Reagan-National?

Delta, United Airlines, and Southwest are the most popular carriers operating from Seattle/Tacoma Intl to Washington, D.C. Reagan-National

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport?

Prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport are updated daily.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport?

There are 7 operators available for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport as of March 2026.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport.

What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?

The necessary travel and health documents for your Washington, D.C. Reagan-National Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$127 Cheap Flights from Seattle to Washington, D.C. Reagan-National Airport in 2026

Q: How many flights depart from Seattle to Washington, D.C. Reagan-National Airport on average per day?

The number of flights available between Seattle and Washington, D.C. Reagan-National Airport is 6 per day as of March 2026. The most frequent departure time is 1:00PM, with 57% of daily flights leaving in the afternoon.

Q: How many flights depart from Seattle to Washington, D.C. Reagan-National Airport on average per week?

As of March 2026, there are 48 flights per week flying from Seattle to Washington, D.C. Reagan-National Airport. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.

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Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

4:20 pm - 4:59 pm

SEA

DCA

21h 39m

1 stop

8:00 am - 9:27 am

DCA

SEA

28h 27m

1 stop

$215Frontier

Thu, Apr 16 - Sun, Apr 19

4:20 pm - 1:00 pm

SEA

DCA

17h 40m

1 stop

8:00 am - 9:27 am

DCA

SEA

28h 27m

1 stop

$216Frontier

Fri, Apr 17 - Sun, Apr 19

7:30 am - 3:27 pm

SEA

DCA

4h 57mnonstop

4:39 pm - 7:30 pm

DCA

SEA

5h 51mnonstop

$218Delta

Fri, May 1 - Tue, May 5

7:12 pm - 1:00 pm

SEA

DCA

14h 48m

1 stop

6:00 pm - 9:27 am

DCA

SEA

18h 27m

1 stop

$219Frontier

Fri, Apr 24 - Sat, Apr 25

9:34 pm - 9:59 pm

SEA

DCA

21h 25m

2 stops

8:00 am - 9:27 am

DCA

SEA

28h 27m

1 stop

$220Frontier

Mon, Apr 13 - Mon, Apr 20

7:12 pm - 1:00 pm

SEA

DCA

14h 48m

1 stop

8:00 am - 9:27 am

DCA

SEA

28h 27m

1 stop

$221Frontier

Sat, Apr 18 - Sun, Apr 26

7:12 pm - 1:00 pm

SEA

DCA

14h 48m

1 stop

8:00 am - 9:27 am

DCA

SEA

28h 27m

1 stop

$223Frontier

Fri, Apr 24 - Sun, Apr 26

12:42 pm - 9:59 pm

SEA

DCA

30h 17m

1 stop

8:00 am - 3:05 pm

DCA

SEA

10h 05m

1 stop

$224Frontier

Thu, Apr 9 - Fri, Apr 17

6:57 pm - 9:59 pm

SEA

DCA

24h 02m

1 stop

6:00 pm - 10:10 am

DCA

SEA

19h 10m

1 stop

$225Frontier

Fri, May 8 - Sat, May 23

12:42 pm - 9:59 pm

SEA

DCA

30h 17m

1 stop

8:00 am - 3:05 pm

DCA

SEA

10h 05m

1 stop

$226Frontier

Mon, Apr 13 - Fri, Apr 17

Frontier flights from Seattle to Washington, D.C. Reagan-National Airport

Our best Frontier deals on Seattle to Washington, D.C. Reagan-National Airport flight tickets

Frontier

Apr 17

SEA4:20 pmSeattle/Tacoma Intl

17h 40m

1 stop

DCA1:00 pmWashington, D.C. Reagan-National

Apr 25

DCA6:00 pmWashington, D.C. Reagan-National

18h 27m

1 stop

SEA9:27 amSeattle/Tacoma Intl

$215

Frontier

Apr 17

SEA4:20 pmSeattle/Tacoma Intl

17h 40m

1 stop

DCA1:00 pmWashington, D.C. Reagan-National

Apr 19

DCA8:00 amWashington, D.C. Reagan-National

28h 27m

1 stop

SEA9:27 amSeattle/Tacoma Intl

$216

Frontier

Apr 24

SEA7:12 pmSeattle/Tacoma Intl

14h 48m

1 stop

DCA1:00 pmWashington, D.C. Reagan-National

Apr 25

DCA6:00 pmWashington, D.C. Reagan-National

18h 27m

1 stop

SEA9:27 amSeattle/Tacoma Intl

$219

Southwest flights from Seattle to Washington, D.C. Reagan-National Airport

Our best Southwest deals on Seattle to Washington, D.C. Reagan-National Airport flight tickets

Southwest

Mar 25

SEA11:55 pmSeattle/Tacoma Intl

8h 20m

1 stop

DCA11:15 amWashington, D.C. Reagan-National

Mar 31

DCA3:35 pmWashington, D.C. Reagan-National

11h 20m

1 stop

SEA11:55 pmSeattle/Tacoma Intl

$293

Southwest

Mar 25

SEA6:45 amSeattle/Tacoma Intl

9h 35m

2 stops

DCA7:20 pmWashington, D.C. Reagan-National

Mar 31

DCA3:35 pmWashington, D.C. Reagan-National

11h 20m

1 stop

SEA11:55 pmSeattle/Tacoma Intl

$389

Southwest

Mar 23

SEA11:55 pmSeattle/Tacoma Intl

11h 20m

1 stop

DCA2:15 pmWashington, D.C. Reagan-National

Mar 24

DCA4:55 pmWashington, D.C. Reagan-National

10h 45m

2 stops

SEA12:40 amSeattle/Tacoma Intl

$478

momondo Fare Finder

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 4/16

4:20 pm-4:59 pm

1 stop21h 39m

Washington, D.C. Reagan-National

Sun 4/19

8:00 am-9:27 am

1 stop28h 27m

$215

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 4/17

4:20 pm-1:00 pm

1 stop17h 40m

Washington, D.C. Reagan-National

Sun 4/19

8:00 am-9:27 am

1 stop28h 27m

$216

Quickest round-trip

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 5/1

7:30 am-3:27 pm

Nonstop4h 57m

Washington, D.C. Reagan-National

Tue 5/5

4:39 pm-7:30 pm

Nonstop5h 51m

$218

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 4/24

7:12 pm-1:00 pm

1 stop14h 48m

Washington, D.C. Reagan-National

Sat 4/25

6:00 pm-9:27 am

1 stop18h 27m

$219

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 4/13

9:34 pm-9:59 pm

2 stops21h 25m

Washington, D.C. Reagan-National

Mon 4/20

8:00 am-9:27 am

1 stop28h 27m

$220

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 4/18

7:12 pm-1:00 pm

1 stop14h 48m

Washington, D.C. Reagan-National

Sun 4/26

8:00 am-9:27 am

1 stop28h 27m

$221

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 4/24

7:12 pm-1:00 pm

1 stop14h 48m

Washington, D.C. Reagan-National

Sun 4/26

8:00 am-9:27 am

1 stop28h 27m

$223

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 4/9

12:42 pm-9:59 pm

1 stop30h 17m

Washington, D.C. Reagan-National

Fri 4/17

8:00 am-3:05 pm

1 stop10h 05m

$224

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 5/8

6:57 pm-9:59 pm

1 stop24h 02m

Washington, D.C. Reagan-National

Sat 5/23

6:00 pm-10:10 am

1 stop19h 10m

$225

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 4/13

12:42 pm-9:59 pm

1 stop30h 17m

Washington, D.C. Reagan-National

Fri 4/17

8:00 am-3:05 pm

1 stop10h 05m

$226

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How to get the cheapest flight ticket from Seattle to Washington, D.C. Reagan-National Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

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Other information

What is the cheapest month to fly to Washington, D.C. Reagan-National Airport?

The month of January is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Seattle, with most prices found around $269. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $333.

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

The cheapest day to depart from Seattle to Washington, D.C. Reagan-National Airport is on a Thursday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Thursday will often find tickets for as low as $369. Flights from Seattle to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $563. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

Our data shows that the cheapest Seattle to Washington, D.C. Reagan-National Airport flights are usually those with departure times in the morning. Our users have found flights to Washington, D.C. Reagan-National Airport in the morning for as low as $414. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is at noon when prices are around $422.

What is the cheapest Seattle/Tacoma Intl to Washington, D.C. Reagan-National flight route?

Fly from Seattle/Tacoma Intl to Washington, D.C. Reagan-National for the best Seattle/Tacoma Intl - Washington, D.C. Reagan-National flight prices

How far in advance should I book a flight to Washington, D.C. Reagan-National Airport?

You are more likely to see cheaper flights to Washington, D.C. Reagan-National Airport from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Reagan-National Airport for around $394 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Reagan-National Airport from Seattle for as low as $308 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Washington, D.C. Reagan-National flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Washington, D.C. Reagan-National flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to Washington, D.C. Reagan-National Airport flights?

You could potentially save up to 14% on your flight if you consider stops on a Seattle to Washington, D.C. Reagan-National Airport flight.

How have Seattle to Washington, D.C. Reagan-National Airport flight prices changed over time?

As of March 2026, prices for Seattle to Washington, D.C. Reagan-National Airport flights are approximately 41% more expensive when compared to flights at the same time last year.

When to book flights from Seattle to Washington, D.C. Reagan-National Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Washington, D.C. Reagan-National Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Seattle to Washington, D.C. Reagan-National Airport (SEA to DCA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Washington, D.C. Reagan-National Airport

Best Price Found	$168
Fastest flight time	4h 57m
Direct flights	Every day

The best one-way flight to Washington, D.C. Reagan-National Airport from Seattle in the past 72 hours is $168. The best round-trip flight deal from Seattle to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $312.

The fastest flight from Seattle to Washington, D.C. Reagan-National Airport takes 4h 57m

Direct flights go from Seattle to Washington, D.C. Reagan-National Airport every day.

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How far is Seattle/Tacoma Intl to Washington, D.C. Reagan-National by plane?
A flight from Seattle/Tacoma Intl to Washington, D.C. Reagan-National will travel around 2322.2 mi. A reasonable flight in good conditions will take 4h 57m.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport are updated daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport?
There are 7 operators available for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport as of March 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Washington, D.C. Reagan-National Airport.
What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?
The necessary travel and health documents for your Washington, D.C. Reagan-National Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to Washington, D.C. Reagan-National Airport?
momondo data reveals that the most frequently booked plane model on the route from Seattle to Washington, D.C. Reagan-National Airport is Boeing 737-800 Passenger/BBJ2 (winglets), representing 34.36% of all bookings. The subsequent popular models are Boeing 737 at 16.60%, Boeing 737 MAX 9 at 12.86%, and Boeing 737-900 at 11.23%.
What is the most popular airline from Seattle to Washington, D.C. Reagan-National Airport?
momondo data reveals that the most frequently booked airline on the route from Seattle to Washington, D.C. Reagan-National Airport is Delta, representing 39% of all bookings. The subsequent popular airlines are Alaska Airlines at 38%, Frontier at 10%, and United Airlines at 5%.

Best airlines flying from Seattle to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from Seattle to Washington, D.C. Reagan-National Airport with momondo

Airline	Rating	Free Cancellation	Price
Hawaiian Airlines	PriceFrom $143	Free Cancellation	Rating 7.8 2,838 reviews	Search Hawaiian Airlines flights
Frontier	PriceFrom $149	Free Cancellation	Rating 5.7 3,033 reviews	Search Frontier flights
Delta	PriceFrom $160	Free Cancellation	Rating 7.9 8,278 reviews	Search Delta flights
Alaska Airlines	PriceFrom $199	Free Cancellation	Rating 8.0 12,027 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $203	Free Cancellation	Rating 7.4 9,415 reviews	Search United Airlines flights
American Airlines	PriceFrom $218	Free Cancellation	Rating 7.1 11,421 reviews	Search American Airlines flights
Southwest	PriceFrom $247	Free Cancellation	Rating 8.0 4,317 reviews	Search Southwest flights

Alaska Airlines Flights From Seattle to Washington, D.C. Reagan-National Airport
The lowest priced Alaska Airlines flight from Seattle to Washington, D.C. Reagan-National Airport from the last 72 hours was $199. Generally, Alaska Airlines has 15 flights on this route every week with an average price of $480. Alaska Airlines is rated 8.0/10 by our users.
Delta Flights From Seattle to Washington, D.C. Reagan-National Airport
Another popular option for Seattle to Washington, D.C. Reagan-National Airport flights is Delta (7.9/10, 8,278 ratings). Delta flies from Seattle to Washington, D.C. Reagan-National Airport around 6 times per week, with deals starting from $160 round-trip and rising to an average price of around $388.

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Colonial Beach

Laurel

Towson

Gaithersburg

Silver Spring

Fredericksburg

Rockville

Tysons

Manassas

Springfield

Bethesda

Fairfax

Linthicum Heights

College Park

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Why should I use momondo to find a flight deal from Seattle to Washington, D.C.?

It is quick and easy to find Seattle to Washington, D.C. flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Washington, D.C. that suits you.

Can I find flights from Seattle to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Seattle to Washington, D.C. flights to just show those with flexible booking policies.

How can momondo help me find flights from Seattle to Washington, D.C.?

momondo helps you find the best flight between Seattle and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Seattle to Washington, D.C. right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Seattle and alert you when they change.

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Cheap flights from Seattle to Washington, D.C. from $127

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Washington, D.C. departing on 4/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Seattle to Washington, D.C. Reagan-National Airport

Our best Frontier deals on Seattle to Washington, D.C. Reagan-National Airport flight tickets

Southwest flights from Seattle to Washington, D.C. Reagan-National Airport

Our best Southwest deals on Seattle to Washington, D.C. Reagan-National Airport flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. Reagan-National Airport that are best for you.

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Seattle to Washington, D.C. Reagan-National Airport

What is the cheapest month to fly to Washington, D.C. Reagan-National Airport?

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

What is the cheapest Seattle/Tacoma Intl to Washington, D.C. Reagan-National flight route?

How far in advance should I book a flight to Washington, D.C. Reagan-National Airport?

What cabin class options are available on Seattle/Tacoma Intl to Washington, D.C. Reagan-National flights?

Can stopping save me money on Seattle to Washington, D.C. Reagan-National Airport flights?

How have Seattle to Washington, D.C. Reagan-National Airport flight prices changed over time?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Washington, D.C. Reagan-National?

What airlines fly to Washington, D.C. Reagan-National Airport?

How many flights depart from Seattle to Washington, D.C. Reagan-National Airport on average per day?

How many flights depart from Seattle to Washington, D.C. Reagan-National Airport on average per week?

When to book flights from Seattle to Washington, D.C. Reagan-National Airport

Cheap Seattle to Washington, D.C. Reagan-National Airport (SEA to DCA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Washington, D.C. Reagan-National Airport

Best Price Found

Fastest flight time

Direct flights

Best airlines flying from Seattle to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from Seattle to Washington, D.C. Reagan-National Airport with momondo

Alaska Airlines Flights From Seattle to Washington, D.C. Reagan-National Airport

Delta Flights From Seattle to Washington, D.C. Reagan-National Airport

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