Which airport is the most popular layover for flights between Seattle and Washington, D.C. Reagan-National Airport?

Denver (DEN) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Seattle to Washington, D.C. Reagan-National Airport?

Detroit (DTW) has the shortest average layover time for this route: 0h 41m.

Which layover airport has the shortest travel time from Seattle to Washington, D.C. Reagan-National Airport?

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 6h 32m.

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

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

Which layover airport offers the lowest fares from Seattle to Washington, D.C. Reagan-National Airport?

Flights via Detroit (DTW) offer the lowest average round-trip price of $236.

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

Alaska Airlines, Delta and Frontier are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from Seattle according to our data. Alaska Airlines is the first choice among our users, with 48% 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.

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 June 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.

$156 Cheap Flights from Seattle to Washington, D.C. Reagan-National Airport in 2026

Q: What is the typical price of a round-trip flight between Seattle and Washington, D.C. Reagan-National Airport?

Prices are currently low for flights on this route. Typical prices usually range from $698 to $386. The lowest price recently found on this route was $295.

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

As of June 2026, there are 27 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 15% of flights taking off on this day.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Washington, D.C.

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:10 am - 4:13 pm

SEA

DCA

8h 03m

1 stop

5:00 am - 9:47 am

DCA

SEA

7h 47m

1 stop

$295American Airlines

Thu, Jul 16 - Tue, Jul 21

7:41 pm - 12:57 pm

SEA

DCA

14h 16m

1 stop

2:00 pm - 9:48 am

DCA

SEA

22h 48m

1 stop

$297Frontier

Tue, Aug 18 - Mon, Aug 31

6:21 am - 9:00 pm

SEA

DCA

11h 39m

1 stop

7:00 am - 9:17 am

DCA

SEA

29h 17m

1 stop

$298Multiple Airlines

Thu, Jul 16 - Mon, Jul 27

1:46 pm - 9:59 pm

SEA

DCA

5h 13mnonstop

5:00 pm - 7:59 pm

DCA

SEA

5h 59mnonstop

$300Alaska Airlines

Wed, Jul 29 - Tue, Aug 11

7:20 am - 3:21 pm

SEA

DCA

5h 01mnonstop

4:35 pm - 7:41 pm

DCA

SEA

6h 06mnonstop

$305Delta

Wed, Aug 26 - Mon, Aug 31

12:35 pm - 12:51 pm

SEA

DCA

21h 16m

1 stop

7:00 am - 9:17 am

DCA

SEA

29h 17m

1 stop

$306Frontier

Thu, Jul 23 - Mon, Jul 27

3:19 pm - 9:59 pm

SEA

DCA

27h 40m

1 stop

2:00 pm - 10:49 pm

DCA

SEA

11h 49m

1 stop

$307Multiple Airlines

Thu, Sep 3 - Mon, Sep 7

7:06 pm - 12:51 pm

SEA

DCA

14h 45m

1 stop

7:00 am - 1:17 pm

DCA

SEA

9h 17m

1 stop

$308Frontier

Fri, Jul 31 - Sun, Aug 9

12:35 pm - 12:51 pm

SEA

DCA

21h 16m

1 stop

7:00 am - 9:17 am

DCA

SEA

29h 17m

1 stop

$309Frontier

Thu, Jul 23 - Mon, Jul 27

7:40 am - 9:00 pm

SEA

DCA

10h 20m

1 stop

5:00 pm - 7:51 pm

DCA

SEA

5h 51mnonstop

$310Alaska Airlines

Sat, Aug 29 - Tue, Sep 8

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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

Frontier

Aug 18

SEA7:41 pmSeattle/Tacoma Intl

14h 16m

1 stop

DCA12:57 pmWashington, D.C. Reagan-National

Aug 31

DCA2:00 pmWashington, D.C. Reagan-National

22h 48m

1 stop

SEA9:48 amSeattle/Tacoma Intl

$297

Frontier

Jul 23

SEA12:35 pmSeattle/Tacoma Intl

21h 16m

1 stop

DCA12:51 pmWashington, D.C. Reagan-National

Jul 27

DCA7:00 amWashington, D.C. Reagan-National

29h 17m

1 stop

SEA9:17 amSeattle/Tacoma Intl

$306

Frontier

Jul 31

SEA7:06 pmSeattle/Tacoma Intl

14h 45m

1 stop

DCA12:51 pmWashington, D.C. Reagan-National

Aug 9

DCA7:00 amWashington, D.C. Reagan-National

9h 17m

1 stop

SEA1:17 pmSeattle/Tacoma Intl

$308

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

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

JetBlue

Aug 19

SEA11:44 pmSeattle/Tacoma Intl

11h 46m

1 stop

DCA2:30 pmWashington, D.C. Reagan-National

Aug 25

DCA2:00 pmWashington, D.C. Reagan-National

11h 49m

1 stop

SEA10:49 pmSeattle/Tacoma Intl

$311

JetBlue

Sep 28

SEA11:55 pmSeattle/Tacoma Intl

11h 55m

1 stop

DCA2:50 pmWashington, D.C. Reagan-National

Sep 30

DCA2:30 pmWashington, D.C. Reagan-National

11h 08m

1 stop

SEA10:38 pmSeattle/Tacoma Intl

$328

JetBlue

Jul 8

SEA11:44 pmSeattle/Tacoma Intl

9h 17m

1 stop

DCA12:01 pmWashington, D.C. Reagan-National

Jul 13

DCA5:00 pmWashington, D.C. Reagan-National

8h 54m

1 stop

SEA10:54 pmSeattle/Tacoma Intl

$342

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 7/16

5:10 am-4:13 pm

1 stop8h 03m

Washington, D.C. Reagan-National

Tue 7/21

5:00 am-9:47 am

1 stop7h 47m

$295

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 8/18

7:41 pm-12:57 pm

1 stop14h 16m

Washington, D.C. Reagan-National

Mon 8/31

2:00 pm-9:48 am

1 stop22h 48m

$297

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 7/16

6:21 am-9:00 pm

1 stop11h 39m

Washington, D.C. Reagan-National

Mon 7/27

7:00 am-9:17 am

1 stop29h 17m

$298

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 7/29

1:46 pm-9:59 pm

Nonstop5h 13m

Washington, D.C. Reagan-National

Tue 8/11

5:00 pm-7:59 pm

Nonstop5h 59m

$300

Quickest round-trip

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 8/26

7:20 am-3:21 pm

Nonstop5h 01m

Washington, D.C. Reagan-National

Mon 8/31

4:35 pm-7:41 pm

Nonstop6h 06m

$305

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 7/23

12:35 pm-12:51 pm

1 stop21h 16m

Washington, D.C. Reagan-National

Mon 7/27

7:00 am-9:17 am

1 stop29h 17m

$306

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 9/3

3:19 pm-9:59 pm

1 stop27h 40m

Washington, D.C. Reagan-National

Mon 9/7

2:00 pm-10:49 pm

1 stop11h 49m

$307

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 7/31

7:06 pm-12:51 pm

1 stop14h 45m

Washington, D.C. Reagan-National

Sun 8/9

7:00 am-1:17 pm

1 stop9h 17m

$308

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 7/23

12:35 pm-12:51 pm

1 stop21h 16m

Washington, D.C. Reagan-National

Mon 7/27

7:00 am-9:17 am

1 stop29h 17m

$309

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 8/29

7:40 am-9:00 pm

1 stop10h 20m

Washington, D.C. Reagan-National

Tue 9/8

5:00 pm-7:51 pm

Nonstop5h 51m

$310

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Airlines

Layovers

Other information

What is the typical price of a round-trip flight between Seattle and Washington, D.C. Reagan-National Airport?

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 $380. Flights from Seattle to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $587. 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 $428. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is at noon when prices are around $451.

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 from Seattle 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 $417 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 $322 on momondo.

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

There are 4 cabin classes available to choose from on Seattle to Washington, D.C. Reagan-National Airport 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?

No. A direct flight is the cheapest option for a flight between Seattle to Washington, D.C. Reagan-National Airport.

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

As of June 2026, prices for Seattle to Washington, D.C. Reagan-National Airport flights are approximately 44% 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	$278
Fastest flight time	5h 01m
Direct flights	Every day

The best one-way flight to Washington, D.C. Reagan-National Airport from Seattle in the past 72 hours is $278. The best round-trip flight deal from Seattle to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $453.

The fastest flight from Seattle to Washington, D.C. Reagan-National Airport takes 5h 01m

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

Search flight deals

Frequently asked questions about flying from Seattle to Washington, D.C. Reagan-National Airport

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 5h 01m.
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 June 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 26.96% of all bookings. The subsequent popular models are Airbus A321neo at 20.75%, Boeing 737 MAX 9 at 14.97%, and Boeing 737 at 14.71%.
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 Alaska Airlines, representing 46% of all bookings. The subsequent popular airlines are Delta at 35%, Frontier at 7%, 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 $138	Free Cancellation	Rating 7.8 2,829 reviews	Search Hawaiian Airlines flights
Frontier	PriceFrom $156	Free Cancellation	Rating 5.6 2,888 reviews	Search Frontier flights
Delta	PriceFrom $165	Free Cancellation	Rating 7.9 8,394 reviews	Search Delta flights
Alaska Airlines	PriceFrom $199	Free Cancellation	Rating 7.9 12,508 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $218	Free Cancellation	Rating 7.1 11,662 reviews	Search American Airlines flights
Southwest	PriceFrom $247	Free Cancellation	Rating 7.9 4,235 reviews	Search Southwest flights
United Airlines	PriceFrom $256	Free Cancellation	Rating 7.4 9,828 reviews	Search United Airlines flights

Delta Flights From Seattle to Washington, D.C. Reagan-National Airport
The lowest priced Delta flight from Seattle to Washington, D.C. Reagan-National Airport from the last 72 hours was $165. Generally, Delta has 7 flights on this route every week with an average price of $395. Delta is rated 7.9/10 by our users.
Alaska Airlines Flights From Seattle to Washington, D.C. Reagan-National Airport
Another popular option for Seattle to Washington, D.C. Reagan-National Airport flights is Alaska Airlines (7.9/10, 12,508 ratings). Alaska Airlines flies from Seattle to Washington, D.C. Reagan-National Airport around 13 times per week, with deals starting from $199 round-trip and rising to an average price of around $515.

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Laurel

Fredericksburg

Gaithersburg

Colonial Beach

Rockville

Linthicum Heights

Silver Spring

Towson

Manassas

Tysons

Springfield

Bethesda

Fairfax

College Park

Why use momondo?

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.

An easier way to manage your Washington, D.C. Reagan-National Airport trip

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Cheap flights from Seattle to Washington, D.C. from $156

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 9/23. 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

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

Our best JetBlue 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 typical price of a round-trip flight between Seattle and 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 from Seattle to Washington, D.C. Reagan-National Airport?

What cabin class options are available on Seattle to Washington, D.C. Reagan-National Airport 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?

Which airport is the most popular layover for flights between Seattle and Washington, D.C. Reagan-National Airport?

Which layover airport offers the lowest fares from Seattle to Washington, D.C. Reagan-National Airport?

Which layover airport has the shortest travel time from Seattle to Washington, D.C. Reagan-National Airport?

Which layover airport has the shortest connection time from Seattle 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

Frequently asked questions about flying from Seattle to Washington, D.C. Reagan-National Airport

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

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

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

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An easier way to manage your Washington, D.C. Reagan-National Airport trip

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