What is the cheapest airline that flies from Seattle/Tacoma Intl to Washington, D.C.?

United Airlines, American Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Washington, D.C.

How many flights depart from Seattle to Washington, D.C. on average per week?

As of July 2025, 279 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Thu, with 18% of weekly flights taking off on this day.

Which layover airport offers the lowest fares from Seattle to Washington, D.C.?

Flights via Detroit (DTW) offer the lowest average round-trip price of $206.

Which airport is the most popular layover for flights between Seattle and Washington, D.C.?

Denver (DEN) was the most common stop: 42% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to Washington, D.C.?

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Washington, D.C. from Seattle according to our data. Alaska Airlines is the first choice among our users, with 52% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 8 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Which layover airport has the shortest travel time from Seattle to Washington, D.C.?

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 6h 57m.

Which layover airport has the shortest connection time from Seattle to Washington, D.C.?

Dallas (DFW) has the shortest average layover time for this route: 1h 02m.

How many flights depart from Seattle to Washington, D.C. on average per day?

39 flights are operational daily from Seattle to Washington, D.C. as of July 2025. The most popular departure time for this route is 1:00PM, with 37% of flights per day taking off in the evening.

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.?

As of July 2025, there are 8 operators available to choose from 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.

$99 Cheap Flights from Seattle to Washington, D.C. in 2025

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

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

11:55 pm - 10:36 amSEA-BWI

7h 41m1 stop

7:15 am - 2:39 pmBWI-SEA

10h 24m1 stop

$207Delta

Find Deal

Wed, Sep 10 - Wed, Oct 1

5:49 pm - 6:00 amSEA-BWI

9h 11m1 stop

4:39 pm - 11:54 pmBWI-SEA

10h 15m1 stop

$233Delta

Find Deal

Sat, Sep 6 - Wed, Sep 17

4:20 pm - 12:23 amSEA-IAD

5h 03mnonstop

7:00 am - 9:38 amIAD-SEA

5h 38mnonstop

$241Hawaiian Airlines

Find Deal

Sat, Sep 13 - Sat, Sep 20

6:00 am - 5:01 pmSEA-DCA

8h 01m1 stop

6:00 pm - 11:02 pmDCA-SEA

8h 02m1 stop

$245Frontier

Find Deal

Sat, Oct 11 - Tue, Oct 21

9:29 pm - 5:39 amSEA-BWI

5h 10mnonstop

7:37 pm - 10:27 pmBWI-SEA

5h 50mnonstop

$251Alaska Airlines

Find Deal

Fri, Sep 12 - Fri, Sep 19

4:20 pm - 12:23 amSEA-IAD

5h 03mnonstop

7:00 am - 9:38 amIAD-SEA

5h 38mnonstop

$251Alaska Airlines

Find Deal

Sat, Sep 13 - Sat, Sep 20

9:29 pm - 5:39 amSEA-BWI

5h 10mnonstop

7:00 am - 9:40 amBWI-SEA

5h 40mnonstop

$253Hawaiian Airlines

Find Deal

Wed, Sep 17 - Sun, Sep 21

6:41 am - 4:59 pmSEA-DCA

7h 18m1 stop

7:00 am - 11:45 amDCA-SEA

7h 45m1 stop

$255Frontier

Find Deal

Tue, Aug 19 - Sat, Aug 23

10:55 pm - 6:58 amSEA-IAD

5h 03mnonstop

8:20 am - 3:32 pmIAD-SEA

10h 12m1 stop

$267United Airlines

Find Deal

Sat, Sep 20 - Tue, Sep 23

11:54 pm - 9:55 amSEA-BWI

7h 01m1 stop

10:10 am - 6:49 pmBWI-SEA

11h 39m2 stops

$282United Airlines

Find Deal

Wed, Aug 27 - Wed, Sep 3

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 12

SEA9:29 pmSeattle/Tacoma Intl

5h 10m

BWI5:39 amBaltimore/Washington

Sep 19

BWI7:37 pmBaltimore/Washington

5h 50m

SEA10:27 pmSeattle/Tacoma Intl

$251

Find similar

Alaska Airlines

Sep 13

SEA11:30 pmSeattle/Tacoma Intl

5h 03m

IAD7:33 amWashington, D.C. Dulles Intl

Sep 20

IAD6:09 pmWashington, D.C. Dulles Intl

5h 47m

SEA8:56 pmSeattle/Tacoma Intl

$252

Find similar

Alaska Airlines

Sep 4

SEA9:29 pmSeattle/Tacoma Intl

5h 10m

BWI5:39 amBaltimore/Washington

Sep 8

BWI7:37 pmBaltimore/Washington

5h 50m

SEA10:27 pmSeattle/Tacoma Intl

$257

Find similar

Southwest flights from Seattle to Washington, D.C.

Our best Southwest deals on Seattle to Washington, D.C. flight tickets

Southwest

Aug 25

SEA10:45 pmSeattle/Tacoma Intl

8h 10m

1 stop

BWI9:55 amBaltimore/Washington

Aug 31

BWI7:35 amBaltimore/Washington

8h 40m

1 stop

SEA1:15 pmSeattle/Tacoma Intl

$286

Find similar

Southwest

Aug 25

SEA10:45 pmSeattle/Tacoma Intl

8h 10m

1 stop

BWI9:55 amBaltimore/Washington

Aug 31

BWI3:00 pmBaltimore/Washington

5h 45m

SEA5:45 pmSeattle/Tacoma Intl

$287

Find similar

Southwest

Sep 3

SEA5:35 amSeattle/Tacoma Intl

8h 55m

2 stops

BWI5:30 pmBaltimore/Washington

Sep 7

BWI2:35 pmBaltimore/Washington

8h 15m

1 stop

SEA7:50 pmSeattle/Tacoma Intl

$292

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 9/10

11:55 pm-10:36 am

1 stop7h 41m

Baltimore/Washington

Wed 10/1

7:15 am-2:39 pm

1 stop10h 24m

$207

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Sat 9/6

5:49 pm-6:00 am

1 stop9h 11m

Baltimore/Washington

Wed 9/17

4:39 pm-11:54 pm

1 stop10h 15m

$233

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 9/13

4:20 pm-12:23 am

Nonstop5h 03m

Washington, D.C. Dulles Intl

Sat 9/20

7:00 am-9:38 am

Nonstop5h 38m

$241

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 10/11

6:00 am-5:01 pm

1 stop8h 01m

Washington, D.C. Reagan-National

Tue 10/21

6:00 pm-11:02 pm

1 stop8h 02m

$245

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 9/12

9:29 pm-5:39 am

Nonstop5h 10m

Baltimore/Washington

Fri 9/19

7:37 pm-10:27 pm

Nonstop5h 50m

$251

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 9/13

4:20 pm-12:23 am

Nonstop5h 03m

Washington, D.C. Dulles Intl

Sat 9/20

7:00 am-9:38 am

Nonstop5h 38m

$251

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 9/17

9:29 pm-5:39 am

Nonstop5h 10m

Baltimore/Washington

Sun 9/21

7:00 am-9:40 am

Nonstop5h 40m

$253

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 8/19

6:41 am-4:59 pm

1 stop7h 18m

Washington, D.C. Reagan-National

Sat 8/23

7:00 am-11:45 am

1 stop7h 45m

$255

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 9/20

10:55 pm-6:58 am

Nonstop5h 03m

Washington, D.C. Dulles Intl

Tue 9/23

8:20 am-3:32 pm

1 stop10h 12m

$267

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 8/27

11:54 pm-9:55 am

1 stop7h 01m

Baltimore/Washington

Wed 9/3

10:10 am-6:49 pm

2 stops11h 39m

$282

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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

Prices

Airlines

Layovers

Other information

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 $334. 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 $357.

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 Tuesday. momondo users have found tickets for Tuesday departures for as low as $440. 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 $565.

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 $366. 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 $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 $422 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 $323 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.

Can stopping save me money on Seattle to Washington, D.C. flights?

You could potentially save up to 22% on your flight if you consider stops on a Seattle to Washington, D.C. flight.

How have Seattle to Washington, D.C. flight prices changed over time?

As of July 2025, prices for Seattle to Washington, D.C. flights are approximately 30% 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	$99
Fastest flight time	4h 58m
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 $99. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $207.

The fastest flight from Seattle to Washington, D.C. takes 4h 58m

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)

Search flight deals

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.. 5h 00m 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.?
As of July 2025, there are 8 operators available to choose from 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.?
Based on momondo bookings for flights between Seattle and Washington, D.C., the leading plane model is Boeing 737 MAX 9, making up 23.29% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 21.51%, Boeing 737-900 Passenger/BBJ3 (winglets) with 15.95%, and Boeing 737 with 11.13%.
What is the most popular airline from Seattle to Washington, D.C.?
momondo data reveals that the most frequently booked airline on the route from Seattle to Washington, D.C. is Alaska Airlines, representing 45% of all bookings. The subsequent popular airlines are Delta at 24%, United Airlines at 19%, and Frontier at 6%.

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
Frontier	PriceFrom $128	Free Cancellation	Rating 5.9 3,239 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $143	Free Cancellation	Rating 7.8 2,611 reviews	Search Hawaiian Airlines flights
Spirit Airlines	PriceFrom $178	Free Cancellation	Rating 6.3 8,049 reviews	Search Spirit Airlines flights
Delta	PriceFrom $204	Free Cancellation	Rating 8.0 7,981 reviews	Search Delta flights
American Airlines	PriceFrom $206	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
United Airlines	PriceFrom $237	Free Cancellation	Rating 7.4 8,900 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $258	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $286	Free Cancellation	Rating 8.0 4,246 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 $204 round-trip, up to an average price of $388. Our users have rated Delta at 8.0/10.
Alaska Airlines Flights From Seattle to Washington, D.C.
Alaska Airlines (8.0/10 from 10,000 reviews) operates around 27 flights from Seattle to Washington, D.C. in any given week. The average Alaska Airlines airfare for this route is around $476, with deals from around $258 rare but found on momondo. Referenced prices are for round-trip Seattle to Washington, D.C. flight searches in the last 72 hours.

Alexandria

Gettysburg

Arlington

National Harbor

Woodbridge

Laurel

Tysons

Silver Spring

Waldorf

Fredericksburg

Manassas

Towson

Rockville

Colonial Beach

Gaithersburg

Fairfax

Reston

Glen Burnie

Linthicum Heights

Springfield

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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Find better results for your trip to the United States

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

Washington, D.C. Reagan-National Airport

Washington, D.C. Dulles Intl Airport

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Cheap flights from Seattle to Washington, D.C. from $99

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 12/15. 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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Alaska Airlines flights from Seattle to Washington, D.C.

Our best Alaska Airlines deals on Seattle to Washington, D.C. flight tickets

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Our best Southwest deals on Seattle to Washington, D.C. flight tickets

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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.?

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

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

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.?

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.

Can stopping save me money on Seattle to Washington, D.C. flights?

You could potentially save up to 22% on your flight if you consider stops on a Seattle to Washington, D.C. flight.

How have Seattle to Washington, D.C. flight prices changed over time?

As of July 2025, prices for Seattle to Washington, D.C. flights are approximately 30% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Washington, D.C.?

United Airlines, American Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Washington, D.C.

What airlines fly to Washington, D.C.?

Which airport is the most popular layover for flights between Seattle and Washington, D.C.?

Denver (DEN) was the most common stop: 42% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Seattle to Washington, D.C.?

Flights via Detroit (DTW) offer the lowest average round-trip price of $206.

Which layover airport has the shortest travel time from Seattle to Washington, D.C.?

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 6h 57m.

Which layover airport has the shortest connection time from Seattle to Washington, D.C.?

Dallas (DFW) has the shortest average layover time for this route: 1h 02m.

How many flights depart from Seattle to Washington, D.C. on average per day?

39 flights are operational daily from Seattle to Washington, D.C. as of July 2025. The most popular departure time for this route is 1:00PM, with 37% of flights per day taking off in the evening.

How many flights depart from Seattle to Washington, D.C. on average per week?

As of July 2025, 279 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Thu, with 18% of weekly flights taking off on this day.

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

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

Fastest flight time

Direct flights

Airports in Washington, D.C.

How far is Seattle/Tacoma Intl to Washington, D.C. by plane?

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

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.?

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

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

Delta Flights From Seattle to Washington, D.C.

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

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

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Washington, D.C.?

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

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

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

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

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States