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Cheap flights from Seattle to Washington, D.C. from $147

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 8/31. 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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Find the cheapest flights from Seattle to Washington, D.C. (SEA-DCA)

Cheap round-trip flights

Frontier Logo
6:12 am - 9:59 pmSEA-DCA
12h 47m1 stop
Frontier Logo
7:00 am - 8:39 pmDCA-SEA
16h 39m1 stop
$240Frontier
Find Deal
Thu, Sep 4 - Sat, Sep 6
Frontier Logo
6:12 am - 9:59 pmSEA-DCA
12h 47m1 stop
Frontier Logo
7:00 am - 10:59 pmDCA-SEA
18h 59m1 stop
$243Frontier
Find Deal
Fri, Sep 19 - Wed, Oct 1
Frontier Logo
1:02 pm - 9:59 pmSEA-DCA
29h 57m1 stop
Frontier Logo
7:00 am - 12:07 pmDCA-SEA
8h 07m1 stop
$247Frontier
Find Deal
Tue, Oct 7 - Tue, Oct 14
Frontier Logo
12:30 pm - 12:10 pmSEA-DCA
20h 40m2 stops
Frontier Logo
7:00 am - 10:59 pmDCA-SEA
18h 59m1 stop
$249Frontier
Find Deal
Fri, Sep 26 - Tue, Sep 30
Alaska Airlines Logo
1:52 pm - 9:59 pmSEA-DCA
5h 07mnonstop
Alaska Airlines Logo
8:00 am - 11:03 amDCA-SEA
6h 03mnonstop
$277Alaska Airlines
Find Deal
Wed, Oct 29 - Sun, Nov 2
Southwest Logo
5:35 am - 3:10 pmSEA-DCA
6h 35m1 stop
Southwest Logo
3:35 pm - 11:25 pmDCA-SEA
10h 50m2 stops
$282Southwest
Find Deal
Wed, Sep 24 - Tue, Sep 30
Hawaiian Airlines Logo
1:52 pm - 9:59 pmSEA-DCA
5h 07mnonstop
Hawaiian Airlines Logo
5:53 pm - 11:32 pmDCA-SEA
8h 39m1 stop
$287Hawaiian Airlines
Find Deal
Thu, Nov 13 - Mon, Nov 17
Southwest Logo
5:00 am - 4:15 pmSEA-DCA
8h 15m2 stops
Southwest Logo
3:35 pm - 9:40 pmDCA-SEA
9h 05m1 stop
$292Southwest
Find Deal
Thu, Sep 25 - Wed, Oct 1
Hawaiian Airlines Logo
7:05 am - 8:00 pmSEA-DCA
9h 55m1 stop
Hawaiian Airlines Logo
8:59 am - 5:21 pmDCA-SEA
11h 22m1 stop
$296Hawaiian Airlines
Find Deal
Tue, Dec 9 - Thu, Dec 11
American Airlines Logo
12:34 am - 11:00 amSEA-DCA
7h 26m1 stop
American Airlines Logo
6:10 am - 11:03 amDCA-SEA
7h 53m1 stop
$297American Airlines
Find Deal
Tue, Oct 7 - Thu, Oct 16

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
Sep 4
SEA6:12 amSeattle/Tacoma Intl
12h 47m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Sep 6
DCA7:00 amWashington, D.C. Reagan-National
16h 39m
1 stop
SEA8:39 pmSeattle/Tacoma Intl
$240
Find similar
Frontier
Sep 19
SEA6:12 amSeattle/Tacoma Intl
12h 47m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Oct 1
DCA7:00 amWashington, D.C. Reagan-National
18h 59m
1 stop
SEA10:59 pmSeattle/Tacoma Intl
$243
Find similar
Frontier
Oct 7
SEA1:02 pmSeattle/Tacoma Intl
29h 57m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Oct 14
DCA7:00 amWashington, D.C. Reagan-National
8h 07m
1 stop
SEA12:07 pmSeattle/Tacoma Intl
$247
Find similar

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
Sep 24
SEA5:35 amSeattle/Tacoma Intl
6h 35m
1 stop
DCA3:10 pmWashington, D.C. Reagan-National
Sep 30
DCA3:35 pmWashington, D.C. Reagan-National
10h 50m
2 stops
SEA11:25 pmSeattle/Tacoma Intl
$282
Find similar
Southwest
Sep 25
SEA5:00 amSeattle/Tacoma Intl
8h 15m
2 stops
DCA4:15 pmWashington, D.C. Reagan-National
Oct 1
DCA3:35 pmWashington, D.C. Reagan-National
9h 05m
1 stop
SEA9:40 pmSeattle/Tacoma Intl
$292
Find similar
Southwest
Oct 27
SEA5:15 amSeattle/Tacoma Intl
9h 10m
1 stop
DCA5:25 pmWashington, D.C. Reagan-National
Oct 30
DCA9:25 amWashington, D.C. Reagan-National
11h 35m
2 stops
SEA6:00 pmSeattle/Tacoma Intl
$302
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 August 21, 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

Thu 9/4

6:12 am-9:59 pm

1 stop12h 47m

Washington, D.C. Reagan-National

Sat 9/6

7:00 am-8:39 pm

1 stop16h 39m

$240

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/19

6:12 am-9:59 pm

1 stop12h 47m

Washington, D.C. Reagan-National

Wed 10/1

7:00 am-10:59 pm

1 stop18h 59m

$243

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 10/7

1:02 pm-9:59 pm

1 stop29h 57m

Washington, D.C. Reagan-National

Tue 10/14

7:00 am-12:07 pm

1 stop8h 07m

$247

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/26

12:30 pm-12:10 pm

2 stops20h 40m

Washington, D.C. Reagan-National

Tue 9/30

7:00 am-10:59 pm

1 stop18h 59m

$249

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 10/29

1:52 pm-9:59 pm

Nonstop5h 07m

Washington, D.C. Reagan-National

Sun 11/2

8:00 am-11:03 am

Nonstop6h 03m

$277

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 9/24

5:35 am-3:10 pm

1 stop6h 35m

Washington, D.C. Reagan-National

Tue 9/30

3:35 pm-11:25 pm

2 stops10h 50m

$282

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 11/13

1:52 pm-9:59 pm

Nonstop5h 07m

Washington, D.C. Reagan-National

Mon 11/17

5:53 pm-11:32 pm

1 stop8h 39m

$287

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 9/25

5:00 am-4:15 pm

2 stops8h 15m

Washington, D.C. Reagan-National

Wed 10/1

3:35 pm-9:40 pm

1 stop9h 05m

$292

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 12/9

7:05 am-8:00 pm

1 stop9h 55m

Washington, D.C. Reagan-National

Thu 12/11

8:59 am-5:21 pm

1 stop11h 22m

$296

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 10/7

12:34 am-11:00 am

1 stop7h 26m

Washington, D.C. Reagan-National

Thu 10/16

6:10 am-11:03 am

1 stop7h 53m

$297

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 November is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Seattle, with most prices found around $402. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of November, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $407.

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 $421. Flights from Seattle to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $557. 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 $487.

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 $454 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 $370 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.

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

As of August 2025, prices for Seattle to Washington, D.C. Reagan-National Airport flights are approximately 12% 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

$238

Fastest flight time

5h 02m

Direct flights

Every day
The best one-way flight to Washington, D.C. Reagan-National Airport from Seattle in the past 72 hours is $238. The best round-trip flight deal from Seattle to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $330.
The fastest flight from Seattle to Washington, D.C. Reagan-National Airport takes 5h 02m
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 07m.

  • 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
3,207 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $148Free CancellationRating
7.8
2,672 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $247Free CancellationRating
8.0
4,245 reviews
Search Southwest flights
United AirlinesPriceFrom $275Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights
DeltaPriceFrom $278Free CancellationRating
7.9
7,981 reviews
Search Delta flights
American AirlinesPriceFrom $286Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $336Free CancellationRating
8.0
10,000 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 $336. Generally, Alaska Airlines has 12 flights on this route every week with an average price of $546. 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, 7,981 ratings). Delta flies from Seattle to Washington, D.C. Reagan-National Airport around 7 times per week, with deals starting from $278 round-trip and rising to an average price of around $441.

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

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

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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