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Cheap flights from Seattle to Washington, D.C. from $120

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 2/5. 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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Alaska Airlines Logo
1:55 pm - 9:59 pm
SEA
-
DCA
5h 04mnonstop
Alaska Airlines Logo
5:01 pm - 8:07 pm
DCA
-
SEA
6h 06mnonstop
$199Alaska Airlines
Fri, Jan 30 - Tue, Feb 3
Frontier Logo
12:34 pm - 1:02 pm
SEA
-
DCA
21h 28m1 stop
Frontier Logo
8:00 am - 11:19 am
DCA
-
SEA
30h 19m1 stop
$200Frontier
Fri, Jan 30 - Sat, Feb 7
Frontier Logo
7:33 pm - 9:59 pm
SEA
-
DCA
23h 26m2 stops
Frontier Logo
6:00 pm - 10:19 am
DCA
-
SEA
19h 19m1 stop
$201Frontier
Tue, Mar 3 - Sat, Mar 7
Frontier Logo
12:34 pm - 4:59 pm
SEA
-
DCA
25h 25m1 stop
Frontier Logo
8:00 am - 11:19 am
DCA
-
SEA
30h 19m1 stop
$202Frontier
Mon, Jan 26 - Thu, Jan 29
Frontier Logo
12:00 pm - 1:00 pm
SEA
-
DCA
22h 00m1 stop
Frontier Logo
8:00 am - 12:01 pm
DCA
-
SEA
31h 01m1 stop
$203Frontier
Sun, Feb 22 - Wed, Feb 25
Frontier Logo
12:34 pm - 9:59 pm
SEA
-
DCA
30h 25m1 stop
Frontier Logo
6:00 pm - 10:54 am
DCA
-
SEA
19h 54m2 stops
$204Frontier
Mon, Feb 2 - Mon, Feb 9
Frontier Logo
6:30 pm - 1:15 pm
SEA
-
DCA
15h 45m2 stops
Frontier Logo
2:00 pm - 10:55 am
DCA
-
SEA
23h 55m1 stop
$205Frontier
Tue, Feb 17 - Thu, Feb 19
American Airlines Logo
8:04 am - 6:44 pm
SEA
-
DCA
7h 40m1 stop
American Airlines Logo
6:00 am - 1:08 pm
DCA
-
SEA
10h 08m1 stop
$208American Airlines
Fri, Jan 30 - Tue, Feb 3
Southwest Logo
5:30 am - 4:20 pm
SEA
-
DCA
7h 50m1 stop
Southwest Logo
7:00 pm - 12:10 am
DCA
-
SEA
8h 10m1 stop
$209Southwest
Wed, Apr 1 - Wed, Apr 29
Southwest Logo
6:45 am - 6:20 pm
SEA
-
DCA
8h 35m1 stop
Southwest Logo
4:05 pm - 10:35 pm
DCA
-
SEA
9h 30m1 stop
$210Southwest
Tue, Jan 27 - Wed, Jan 28

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 30
SEA12:34 pmSeattle/Tacoma Intl
21h 28m
1 stop
DCA1:02 pmWashington, D.C. Reagan-National
Feb 7
DCA8:00 amWashington, D.C. Reagan-National
30h 19m
1 stop
SEA11:19 amSeattle/Tacoma Intl
$200
Find similar
Frontier
Mar 3
SEA7:33 pmSeattle/Tacoma Intl
23h 26m
2 stops
DCA9:59 pmWashington, D.C. Reagan-National
Mar 7
DCA6:00 pmWashington, D.C. Reagan-National
19h 19m
1 stop
SEA10:19 amSeattle/Tacoma Intl
$201
Find similar
Frontier
Jan 26
SEA12:34 pmSeattle/Tacoma Intl
25h 25m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
Jan 29
DCA8:00 amWashington, D.C. Reagan-National
30h 19m
1 stop
SEA11:19 amSeattle/Tacoma Intl
$202
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
Apr 1
SEA5:30 amSeattle/Tacoma Intl
7h 50m
1 stop
DCA4:20 pmWashington, D.C. Reagan-National
Apr 29
DCA7:00 pmWashington, D.C. Reagan-National
8h 10m
1 stop
SEA12:10 amSeattle/Tacoma Intl
$209
Find similar
Southwest
Jan 27
SEA6:45 amSeattle/Tacoma Intl
8h 35m
1 stop
DCA6:20 pmWashington, D.C. Reagan-National
Jan 28
DCA4:05 pmWashington, D.C. Reagan-National
9h 30m
1 stop
SEA10:35 pmSeattle/Tacoma Intl
$210
Find similar
Southwest
Feb 3
SEA6:05 amSeattle/Tacoma Intl
11h 10m
2 stops
DCA8:15 pmWashington, D.C. Reagan-National
Feb 10
DCA6:00 amWashington, D.C. Reagan-National
10h 15m
1 stop
SEA1:15 pmSeattle/Tacoma Intl
$215
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 January 7, 2026.
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

Fri 1/30

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

Tue 2/3

5:01 pm-8:07 pm

Nonstop6h 06m

$199

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/30

12:34 pm-1:02 pm

1 stop21h 28m

Washington, D.C. Reagan-National

Sat 2/7

8:00 am-11:19 am

1 stop30h 19m

$200

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 3/3

7:33 pm-9:59 pm

2 stops23h 26m

Washington, D.C. Reagan-National

Sat 3/7

6:00 pm-10:19 am

1 stop19h 19m

$201

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 1/26

12:34 pm-4:59 pm

1 stop25h 25m

Washington, D.C. Reagan-National

Thu 1/29

8:00 am-11:19 am

1 stop30h 19m

$202

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 2/22

12:00 pm-1:00 pm

1 stop22h 00m

Washington, D.C. Reagan-National

Wed 2/25

8:00 am-12:01 pm

1 stop31h 01m

$203

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 2/2

12:34 pm-9:59 pm

1 stop30h 25m

Washington, D.C. Reagan-National

Mon 2/9

6:00 pm-10:54 am

2 stops19h 54m

$204

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 2/17

6:30 pm-1:15 pm

2 stops15h 45m

Washington, D.C. Reagan-National

Thu 2/19

2:00 pm-10:55 am

1 stop23h 55m

$205

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 1/30

8:04 am-6:44 pm

1 stop7h 40m

Washington, D.C. Reagan-National

Tue 2/3

6:00 am-1:08 pm

1 stop10h 08m

$208

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 4/1

5:30 am-4:20 pm

1 stop7h 50m

Washington, D.C. Reagan-National

Wed 4/29

7:00 pm-12:10 am

1 stop8h 10m

$209

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 1/27

6:45 am-6:20 pm

1 stop8h 35m

Washington, D.C. Reagan-National

Wed 1/28

4:05 pm-10:35 pm

1 stop9h 30m

$210

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 January is also cheap. Prices for this month can be found on momondo for an average of $383.

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 $383. Flights from Seattle to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $576. 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 $425. 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 $423 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 $342 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 January 2026, prices for Seattle to Washington, D.C. Reagan-National Airport flights are approximately 9% cheaper 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

$438

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 $438. The best round-trip flight deal from Seattle to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $221.
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.
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 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?

  • 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
Hawaiian AirlinesPriceFrom $143Free CancellationRating
7.8
2,824 reviews
Search Hawaiian Airlines flights
FrontierPriceFrom $157Free CancellationRating
5.7
3,063 reviews
Search Frontier flights
DeltaPriceFrom $196Free CancellationRating
7.9
8,022 reviews
Search Delta flights
United AirlinesPriceFrom $243Free CancellationRating
7.4
9,138 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $274Free CancellationRating
8.0
11,656 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
11,088 reviews
Search American Airlines flights
SouthwestPriceFrom $296Free CancellationRating
8.0
4,249 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 $274. Generally, Alaska Airlines has 14 flights on this route every week with an average price of $516. 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, 8,021 ratings). Delta flies from Seattle to Washington, D.C. Reagan-National Airport around 7 times per week, with deals starting from $196 round-trip and rising to an average price of around $422.

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
Waldorf
Woodbridge
Tysons
Laurel
Colonial Beach
Silver Spring
Towson
Fredericksburg
Rockville
Gaithersburg
Manassas
Fairfax
Springfield
Glen Burnie
Linthicum Heights
Reston

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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