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Cheap flights from Seattle to Washington, D.C. from $85

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 6/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Washington, D.C..
Frontier Logo
6:25 am - 9:59 pmSEA-DCA
12h 34m1 stop
Frontier Logo
7:00 am - 11:37 pmDCA-SEA
19h 37m1 stop
$175Frontier
Find Deal
Sat, Jun 7 - Tue, Jun 10
Frontier Logo
6:24 am - 4:59 pmSEA-DCA
7h 35m1 stop
Frontier Logo
6:00 pm - 11:49 pmDCA-SEA
8h 49m1 stop
$176Frontier
Find Deal
Wed, May 7 - Wed, May 14
Delta Logo
6:00 am - 5:38 pmSEA-BWI
8h 38m1 stop
Delta Logo
4:45 pm - 11:05 pmBWI-SEA
9h 20m1 stop
$207Delta
Find Deal
Sat, Jun 7 - Tue, Jun 10
Delta Logo
7:33 pm - 6:02 amSEA-BWI
7h 29m1 stop
Delta Logo
4:39 pm - 10:25 pmBWI-SEA
8h 46m1 stop
$243Delta
Find Deal
Wed, Oct 8 - Wed, Oct 15
Alaska Airlines Logo
4:00 pm - 11:59 pmSEA-IAD
4h 59mnonstop
Alaska Airlines Logo
7:15 am - 1:44 pmIAD-SEA
9h 29m1 stop
$265Alaska Airlines
Find Deal
Tue, Jun 3 - Tue, Jun 10
Alaska Airlines Logo
8:25 am - 9:05 pmSEA-DCA
9h 40m1 stop
Alaska Airlines Logo
5:00 pm - 7:56 pmDCA-SEA
5h 56mnonstop
$267Alaska Airlines
Find Deal
Tue, May 20 - Tue, May 27
United Airlines Logo
11:59 pm - 9:58 amSEA-DCA
6h 59m1 stop
United Airlines Logo
1:00 pm - 6:53 pmDCA-SEA
8h 53m1 stop
$277United Airlines
Find Deal
Tue, May 20 - Tue, May 27
United Airlines Logo
7:15 pm - 5:22 amSEA-IAD
7h 07m1 stop
United Airlines Logo
5:36 pm - 10:30 pmIAD-SEA
7h 54m1 stop
$277United Airlines
Find Deal
Wed, May 21 - Wed, May 28
American Airlines Logo
12:05 am - 11:00 amSEA-DCA
7h 55m1 stop
American Airlines Logo
9:29 am - 2:18 pmDCA-SEA
7h 49m1 stop
$318American Airlines
Find Deal
Fri, Jun 6 - Tue, Jun 10
American Airlines Logo
9:50 pm - 8:38 amSEA-IAD
7h 48m1 stop
American Airlines Logo
6:43 pm - 12:44 amIAD-SEA
9h 01m1 stop
$318American Airlines
Find Deal
Sat, Jun 7 - Tue, Jun 10

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

Our best Hawaiian Airlines deals on Seattle to Washington, D.C. flight tickets
Hawaiian Airlines
Jun 3
SEA1:48 pmSeattle/Tacoma Intl
5h 11m
DCA9:59 pmWashington, D.C. Reagan-National
Jun 4
DCA8:00 amWashington, D.C. Reagan-National
5h 39m
SEA10:39 amSeattle/Tacoma Intl
Hawaiian Airlines
Jun 7
SEA11:30 pmSeattle/Tacoma Intl
5h 06m
IAD7:36 amWashington, D.C. Dulles Intl
Jun 10
IAD7:15 amWashington, D.C. Dulles Intl
9h 29m
1 stop
SEA1:44 pmSeattle/Tacoma Intl
Hawaiian Airlines
May 24
SEA6:49 pmSeattle/Tacoma Intl
8h 06m
1 stop
IAD5:55 amWashington, D.C. Dulles Intl
May 31
IAD9:00 amWashington, D.C. Dulles Intl
5h 39m
SEA11:39 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
Jun 3
SEA4:00 pmSeattle/Tacoma Intl
4h 59m
IAD11:59 pmWashington, D.C. Dulles Intl
Jun 10
IAD7:15 amWashington, D.C. Dulles Intl
9h 29m
1 stop
SEA1:44 pmSeattle/Tacoma Intl
Alaska Airlines
Jun 7
SEA4:00 pmSeattle/Tacoma Intl
4h 59m
IAD11:59 pmWashington, D.C. Dulles Intl
Jun 10
IAD7:15 amWashington, D.C. Dulles Intl
9h 29m
1 stop
SEA1:44 pmSeattle/Tacoma Intl
Alaska Airlines
May 13
SEA4:00 pmSeattle/Tacoma Intl
4h 58m
IAD11:58 pmWashington, D.C. Dulles Intl
May 20
IAD6:30 amWashington, D.C. Dulles Intl
5h 40m
SEA9:10 amSeattle/Tacoma Intl

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 $322. If you’re not able to fly to Washington, D.C. in September, then March is your next best option. Flight prices from Seattle to Washington, D.C. during March average around $358.

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 $464. 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 $583.

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 $393. 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 at noon because they tend to be around $562. 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 6 weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $406 when searching 6 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 $319 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 April 2025, prices for Seattle to Washington, D.C. flights are approximately 7% more expensive 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

$85

Fastest flight time

4h 56m

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 $85. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $175.
The fastest flight from Seattle to Washington, D.C. takes 4h 56m
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 56m 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 $86Free CancellationRating
5.9
3,283 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $143Free CancellationRating
7.9
2,393 reviews
Search Hawaiian Airlines flights
Sun Country AirPriceFrom $169Free CancellationRating
6.9
349 reviews
Search Sun Country Air flights
Spirit AirlinesPriceFrom $178Free CancellationRating
6.3
7,940 reviews
Search Spirit Airlines flights
DeltaPriceFrom $198Free CancellationRating
8.0
7,920 reviews
Search Delta flights
American AirlinesPriceFrom $206Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $238Free CancellationRating
7.4
8,683 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $246Free CancellationRating
8.0
9,911 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $321Free CancellationRating
8.0
4,287 reviews
Search Southwest flights
  • Delta Flights From Seattle to Washington, D.C.

    Delta is one of the most popular airlines flying from Seattle to Washington, D.C., operating 14 flights/week on average for this route. A good Delta flight deal for Seattle to Washington, D.C. starts from $198 round-trip, up to an average price of $408. Our users have rated Delta at 8.0/10.

  • Alaska Airlines Flights From Seattle to Washington, D.C.

    Alaska Airlines (8.0/10 from 9,911 reviews) operates around 18 flights from Seattle to Washington, D.C. in any given week. The average Alaska Airlines airfare for this route is around $498, with deals from around $246 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
Arlington
Gettysburg
National Harbor
Laurel
Silver Spring
Woodbridge
Tysons
Fredericksburg
Waldorf
Manassas
Gaithersburg
Rockville
Glen Burnie
Towson
Linthicum Heights
Fairfax
Reston
Springfield
Hyattsville

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

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1 adult
From?
To?
Mon 4/28
Mon 5/5

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.