Cheap flights from Seattle to Washington, D.C. from $136

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 10/13. 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-WAS)

Cheap round-trip flights

Southwest Logo
9:10 pm - 5:10 amSEA-BWI
5h 00mnonstop
Southwest Logo
8:25 am - 11:15 amBWI-SEA
5h 50mnonstop
$187Southwest
Find Deal
Fri, Sep 26 - Tue, Sep 30
Alaska Airlines Logo
9:29 pm - 5:39 amSEA-BWI
5h 10mnonstop
Alaska Airlines Logo
7:37 pm - 10:27 pmBWI-SEA
5h 50mnonstop
$197Alaska Airlines
Find Deal
Mon, Sep 22 - Tue, Sep 30
Delta Logo
12:00 pm - 11:50 pmSEA-BWI
8h 50m1 stop
Delta Logo
6:00 am - 10:45 amBWI-SEA
7h 45m1 stop
$207Delta
Find Deal
Mon, Jan 5 - Wed, Jan 21
Frontier Logo
6:12 am - 5:42 pmSEA-BWI
8h 30m1 stop
Frontier Logo
6:27 pm - 12:30 amBWI-SEA
9h 03m1 stop
$220Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Hawaiian Airlines Logo
9:29 pm - 5:39 amSEA-BWI
5h 10mnonstop
Hawaiian Airlines Logo
7:37 pm - 10:27 pmBWI-SEA
5h 50mnonstop
$226Hawaiian Airlines
Find Deal
Mon, Sep 22 - Tue, Sep 30
Frontier Logo
6:12 am - 5:42 pmSEA-BWI
8h 30m1 stop
Frontier Logo
6:27 pm - 12:30 amBWI-SEA
9h 03m1 stop
$227Frontier
Find Deal
Mon, Sep 15 - Sun, Sep 21
Hawaiian Airlines Logo
11:40 pm - 10:36 amSEA-BWI
7h 56m1 stop
Hawaiian Airlines Logo
7:37 pm - 10:27 pmBWI-SEA
5h 50mnonstop
$229Hawaiian Airlines
Find Deal
Mon, Sep 22 - Tue, Sep 30
Delta Logo
5:45 pm - 6:00 amSEA-BWI
9h 15m1 stop
Delta Logo
6:48 am - 12:04 pmBWI-SEA
8h 16m1 stop
$252Delta
Find Deal
Fri, Sep 19 - Wed, Sep 24
United Airlines Logo
10:55 pm - 6:58 amSEA-IAD
5h 03mnonstop
United Airlines Logo
12:52 pm - 5:53 pmIAD-SEA
8h 01m1 stop
$287United Airlines
Find Deal
Wed, Sep 24 - Sat, Sep 27
United Airlines Logo
11:10 pm - 10:28 amSEA-DCA
8h 18m1 stop
United Airlines Logo
4:47 pm - 10:52 pmDCA-SEA
9h 05m1 stop
$292United Airlines
Find Deal
Fri, Sep 19 - Mon, Sep 22

Delta flights from Seattle to Washington, D.C.

Our best Delta deals on Seattle to Washington, D.C. flight tickets
Delta
Jan 5
SEA12:00 pmSeattle/Tacoma Intl
8h 50m
1 stop
BWI11:50 pmBaltimore/Washington
Jan 21
BWI6:00 amBaltimore/Washington
7h 45m
1 stop
SEA10:45 amSeattle/Tacoma Intl
Delta
Sep 19
SEA5:45 pmSeattle/Tacoma Intl
9h 15m
1 stop
BWI6:00 amBaltimore/Washington
Sep 24
BWI6:48 amBaltimore/Washington
8h 16m
1 stop
SEA12:04 pmSeattle/Tacoma Intl
Delta
Sep 22
SEA9:55 pmSeattle/Tacoma Intl
5h 06m
IAD6:01 amWashington, D.C. Dulles Intl
Sep 30
IAD7:35 amWashington, D.C. Dulles Intl
5h 41m
SEA10:16 amSeattle/Tacoma Intl

Alaska Airlines flights from Seattle to Washington, D.C.

Our best Alaska Airlines deals on Seattle to Washington, D.C. flight tickets
Alaska Airlines
Sep 22
SEA9:29 pmSeattle/Tacoma Intl
5h 10m
BWI5:39 amBaltimore/Washington
Sep 30
BWI7:37 pmBaltimore/Washington
5h 50m
SEA10:27 pmSeattle/Tacoma Intl
Alaska Airlines
Sep 22
SEA9:29 pmSeattle/Tacoma Intl
5h 10m
BWI5:39 amBaltimore/Washington
Sep 30
BWI7:37 pmBaltimore/Washington
5h 50m
SEA10:27 pmSeattle/Tacoma Intl
Alaska Airlines
Sep 22
SEA9:29 pmSeattle/Tacoma Intl
5h 10m
BWI5:39 amBaltimore/Washington
Sep 30
BWI7:37 pmBaltimore/Washington
5h 50m
SEA10:27 pmSeattle/Tacoma Intl

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Washington, D.C. 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 28, 2025.
Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 9/26

9:10 pm-5:10 am

Nonstop5h 00m

Baltimore/Washington

Tue 9/30

8:25 am-11:15 am

Nonstop5h 50m

$187

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 9/22

9:29 pm-5:39 am

Nonstop5h 10m

Baltimore/Washington

Tue 9/30

7:37 pm-10:27 pm

Nonstop5h 50m

$197

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 1/5

12:00 pm-11:50 pm

1 stop8h 50m

Baltimore/Washington

Wed 1/21

6:00 am-10:45 am

1 stop7h 45m

$207

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 10/3

6:12 am-5:42 pm

1 stop8h 30m

Baltimore/Washington

Sun 10/5

6:27 pm-12:30 am

1 stop9h 03m

$220

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 9/22

9:29 pm-5:39 am

Nonstop5h 10m

Baltimore/Washington

Tue 9/30

7:37 pm-10:27 pm

Nonstop5h 50m

$226

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 9/15

6:12 am-5:42 pm

1 stop8h 30m

Baltimore/Washington

Sun 9/21

6:27 pm-12:30 am

1 stop9h 03m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 9/22

11:40 pm-10:36 am

1 stop7h 56m

Baltimore/Washington

Tue 9/30

7:37 pm-10:27 pm

Nonstop5h 50m

$229

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 9/19

5:45 pm-6:00 am

1 stop9h 15m

Baltimore/Washington

Wed 9/24

6:48 am-12:04 pm

1 stop8h 16m

$252

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 9/24

10:55 pm-6:58 am

Nonstop5h 03m

Washington, D.C. Dulles Intl

Sat 9/27

12:52 pm-5:53 pm

1 stop8h 01m

$287

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 9/19

11:10 pm-10:28 am

1 stop8h 18m

Washington, D.C. Reagan-National

Mon 9/22

4:47 pm-10:52 pm

1 stop9h 05m

$292

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.

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.?

The month of September is, on average, the cheapest month to fly to Washington, D.C. from Seattle, with most prices found around $317. If you’re not able to fly to Washington, D.C. in September, then July is your next best option. Flight prices from Seattle to Washington, D.C. during July average around $355.

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

On average, the least expensive day to fly to Washington, D.C. from Seattle is on a Thursday. momondo users have found tickets for Thursday departures for as low as $446. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Washington, D.C. for around $574.

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

In the afternoon is the cheapest time of day to fly from Seattle to Washington, D.C. when you can find flight prices for as low as $370. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $504. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

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

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

You are more likely to see cheaper flights to Washington, D.C. from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $400 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from Seattle for as low as $317 on momondo.

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

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Washington, D.C. 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. flight prices changed over time?

As of August 2025, prices for Seattle to Washington, D.C. flights are approximately 10% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Washington, D.C. 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. (SEA to WAS) flight deals and tips

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

Best Price Found

$196

Fastest flight time

4h 52m

Direct flights

Every day

Airports in Washington, D.C.

3 airports
The best one-way flight to Washington, D.C. from Seattle in the past 72 hours is $196. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $316.
The fastest flight from Seattle to Washington, D.C. takes 4h 52m
Direct flights go from Seattle to Washington, D.C. every day.
There are 3 airports near Washington, D.C.: Washington, D.C. Reagan-National (DCA), Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
  • How far is Seattle/Tacoma Intl to Washington, D.C. by plane?

    There are 2320.5 mi between Seattle/Tacoma Intl and Washington, D.C.. 4h 52m is a normal flight duration for this route.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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..

  • What documentation or ID do you need to fly to Washington, D.C.?

    The travel and health documents you'll need for your trip to Washington, D.C. may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington, D.C.. It is always advisable to seek 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.?

  • What is the most popular airline from Seattle to Washington, D.C.?

Best airlines flying from Seattle to Washington, D.C.

Compare and see reviews for airlines that fly from Seattle to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $128Free CancellationRating
5.8
3,204 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $130Free CancellationRating
6.3
8,028 reviews
Search Spirit Airlines flights
Hawaiian AirlinesPriceFrom $143Free CancellationRating
7.8
2,688 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $201Free CancellationRating
7.9
7,977 reviews
Search Delta flights
American AirlinesPriceFrom $206Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $237Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights
SouthwestPriceFrom $247Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $262Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
  • Alaska Airlines Flights From Seattle to Washington, D.C.

    Alaska Airlines is one of the most popular airlines flying from Seattle to Washington, D.C., operating 24 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to Washington, D.C. starts from $262 round-trip, up to an average price of $477. Our users have rated Alaska Airlines at 8.0/10.

  • Delta Flights From Seattle to Washington, D.C.

    Delta (7.9/10 from 7,977 reviews) operates around 14 flights from Seattle to Washington, D.C. in any given week. The average Delta airfare for this route is around $389, with deals from around $201 rare but found on momondo. Referenced prices are for round-trip Seattle to Washington, D.C. flight searches in the last 72 hours.

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
Laurel
Silver Spring
Colonial Beach
Fredericksburg
Towson
Manassas
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.?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Washington, D.C. from Seattle.

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

Flights from Seattle to Washington, D.C. with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Seattle to Washington, D.C. flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to Washington, D.C. from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Washington, D.C. trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

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1 adult
Tue 9/2
Tue 9/9

Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.