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Cheap flights from Seattle to Washington, D.C. from $135

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 1/16. 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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Cheap round-trip flights

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Hawaiian Airlines Logo
1:55 pm - 9:59 pmSEA-DCA
5h 04mnonstop
Hawaiian Airlines Logo
8:00 am - 11:09 amDCA-SEA
6h 09mnonstop
$231Hawaiian Airlines
Find Deal
qui, jan 8 - qua, jan 14
Frontier Logo
12:19 pm - 5:00 pmSEA-DCA
25h 41m1 stop
Frontier Logo
8:00 am - 11:09 amDCA-SEA
30h 09m1 stop
$234Frontier
Find Deal
sex, jan 16 - dom, jan 18
Frontier Logo
12:48 pm - 1:06 pmSEA-DCA
21h 18m1 stop
Frontier Logo
2:00 pm - 1:30 pmDCA-SEA
26h 30m2 stops
$235Frontier
Find Deal
dom, dez 7 - sáb, dez 13
Frontier Logo
12:34 pm - 12:04 pmSEA-DCA
20h 30m1 stop
Frontier Logo
6:00 pm - 9:36 amDCA-SEA
18h 36m2 stops
$237Frontier
Find Deal
qui, jan 22 - qui, jan 29
Alaska Airlines Logo
1:55 pm - 9:59 pmSEA-DCA
5h 04mnonstop
Alaska Airlines Logo
5:01 pm - 8:07 pmDCA-SEA
6h 06mnonstop
$238Alaska Airlines
Find Deal
qui, jan 22 - sáb, jan 31
Delta Logo
7:20 am - 3:20 pmSEA-DCA
5h 00mnonstop
Delta Logo
4:44 pm - 7:43 pmDCA-SEA
5h 59mnonstop
$239Delta
Find Deal
ter, jan 20 - sáb, jan 31
Frontier Logo
2:25 pm - 1:06 pmSEA-DCA
19h 41m2 stops
Frontier Logo
2:00 pm - 11:53 amDCA-SEA
24h 53m1 stop
$240Frontier
Find Deal
qui, dez 4 - sex, dez 12
Frontier Logo
2:46 pm - 4:59 pmSEA-DCA
23h 13m2 stops
Frontier Logo
6:00 pm - 11:21 amDCA-SEA
20h 21m1 stop
$246Frontier
Find Deal
qua, dez 31 - sáb, jan 10
Alaska Airlines Logo
1:56 pm - 9:59 pmSEA-DCA
5h 03mnonstop
Alaska Airlines Logo
5:01 pm - 8:07 pmDCA-SEA
6h 06mnonstop
$248Alaska Airlines
Find Deal
sex, dez 12 - qui, jan 8
Delta Logo
7:20 am - 3:20 pmSEA-DCA
5h 00mnonstop
Delta Logo
6:00 am - 12:20 pmDCA-SEA
9h 20m1 stop
$249Delta
Find Deal
ter, jan 20 - sex, jan 30

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
Jan 16
SEA12:19 pmSeattle/Tacoma Intl
25h 41m
1 stop
DCA5:00 pmWashington, D.C. Reagan-National
Jan 18
DCA8:00 amWashington, D.C. Reagan-National
30h 09m
1 stop
SEA11:09 amSeattle/Tacoma Intl
$234
Find similar
Frontier
Dec 7
SEA12:48 pmSeattle/Tacoma Intl
21h 18m
1 stop
DCA1:06 pmWashington, D.C. Reagan-National
Dec 13
DCA2:00 pmWashington, D.C. Reagan-National
26h 30m
2 stops
SEA1:30 pmSeattle/Tacoma Intl
$235
Find similar
Frontier
Jan 12
SEA1:02 pmSeattle/Tacoma Intl
20h 02m
2 stops
DCA12:04 pmWashington, D.C. Reagan-National
Jan 15
DCA8:00 amWashington, D.C. Reagan-National
30h 09m
1 stop
SEA11:09 amSeattle/Tacoma Intl
$236
Find similar

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

Our best American Airlines deals on Seattle to Washington, D.C. Reagan-National Airport flight tickets
American Airlines
Dec 11
SEA12:38 amSeattle/Tacoma Intl
7h 21m
1 stop
DCA10:59 amWashington, D.C. Reagan-National
Dec 14
DCA3:25 pmWashington, D.C. Reagan-National
11h 00m
1 stop
SEA11:25 pmSeattle/Tacoma Intl
$263
Find similar
American Airlines
Nov 28
SEA7:19 amSeattle/Tacoma Intl
8h 23m
1 stop
DCA6:42 pmWashington, D.C. Reagan-National
Dec 13
DCA12:59 pmWashington, D.C. Reagan-National
8h 56m
1 stop
SEA6:55 pmSeattle/Tacoma Intl
$607
Find similar
American Airlines
Nov 28
SEA11:34 amSeattle/Tacoma Intl
8h 26m
1 stop
DCA11:00 pmWashington, D.C. Reagan-National
Dec 14
DCA4:43 pmWashington, D.C. Reagan-National
8h 07m
1 stop
SEA9:50 pmSeattle/Tacoma Intl
$632
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Washington, D.C. Reagan-National Airport 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, momondo users made 832,500 searches. Data last updated novembro 20, 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

Fly to

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

qui 1/8

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

qua 1/14

8:00 am-11:09 am

Nonstop6h 09m

$231

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

sex 1/16

12:19 pm-5:00 pm

1 stop25h 41m

Washington, D.C. Reagan-National

dom 1/18

8:00 am-11:09 am

1 stop30h 09m

$234

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

dom 12/7

12:48 pm-1:06 pm

1 stop21h 18m

Washington, D.C. Reagan-National

sáb 12/13

2:00 pm-1:30 pm

2 stops26h 30m

$235

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

qui 1/22

12:34 pm-12:04 pm

1 stop20h 30m

Washington, D.C. Reagan-National

qui 1/29

6:00 pm-9:36 am

2 stops18h 36m

$237

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

qui 1/22

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

sáb 1/31

5:01 pm-8:07 pm

Nonstop6h 06m

$238

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

ter 1/20

7:20 am-3:20 pm

Nonstop5h 00m

Washington, D.C. Reagan-National

sáb 1/31

4:44 pm-7:43 pm

Nonstop5h 59m

$239

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

qui 12/4

2:25 pm-1:06 pm

2 stops19h 41m

Washington, D.C. Reagan-National

sex 12/12

2:00 pm-11:53 am

1 stop24h 53m

$240

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

qua 12/31

2:46 pm-4:59 pm

2 stops23h 13m

Washington, D.C. Reagan-National

sáb 1/10

6:00 pm-11:21 am

1 stop20h 21m

$246

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

sex 12/12

1:56 pm-9:59 pm

Nonstop5h 03m

Washington, D.C. Reagan-National

qui 1/8

5:01 pm-8:07 pm

Nonstop6h 06m

$248

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

ter 1/20

7:20 am-3:20 pm

Nonstop5h 00m

Washington, D.C. Reagan-National

sex 1/30

6:00 am-12:20 pm

1 stop9h 20m

$249

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

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

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

The month of September is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Seattle, with most prices found around $382. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $392.

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 Friday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Friday will often find tickets for as low as $411. Flights from Seattle to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $535. 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 afternoon. Our users have found flights to Washington, D.C. Reagan-National Airport in the afternoon for as low as $323. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is at noon when prices are around $456.

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 $439 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 $367 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 November 2025, prices for Seattle to Washington, D.C. Reagan-National Airport flights are approximately 19% 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

$243

Fastest flight time

4h 56m

Direct flights

Every day
The best one-way flight to Washington, D.C. Reagan-National Airport from Seattle in the past 72 hours is $243. The best round-trip flight deal from Seattle to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $304.
The fastest flight from Seattle to Washington, D.C. Reagan-National Airport takes 4h 56m
Direct flights go from Seattle to Washington, D.C. Reagan-National Airport every day.
Search flight deals

  • 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 00m.

  • 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?

  • 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?

  • What is the most popular airline 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
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $128Free CancellationRating
5.8
3,104 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $143Free CancellationRating
7.8
2,811 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
8,002 reviews
Search Delta flights
United AirlinesPriceFrom $269Free CancellationRating
7.4
9,028 reviews
Search United Airlines flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
SouthwestPriceFrom $296Free CancellationRating
8.0
4,249 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $302Free CancellationRating
8.0
11,322 reviews
Search Alaska Airlines 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 $302. Generally, Alaska Airlines has 3 flights on this route every week with an average price of $525. 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, 8,002 ratings). Delta flies from Seattle to Washington, D.C. Reagan-National Airport around 7 times per week, with deals starting from $236 round-trip and rising to an average price of around $432.

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Reston
Manassas
Gaithersburg
Fairfax
Glen Burnie
Linthicum Heights
Springfield

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.

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