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

As of October 2025, 147 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 32% of weekly flights taking off on this day.

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

Flights via Chicago (ORD) offer the lowest average round-trip price of $198.

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.

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

21 flights are operational daily from Seattle to Washington, D.C. as of October 2025. The most popular departure time for this route is 1:00PM, with 44% of flights per day taking off at noon.

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

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

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.

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

Denver (DEN) was the most common stop: 31% 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 51% 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.

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 October 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.

$64 Cheap Flights from Seattle to Washington, D.C. in 2025/26

Q: What is the typical price of a round-trip flight between Seattle and Washington, D.C.?

Prices are currently low for flights on this route. Typical prices usually range from $300 to $604. The lowest price recently found on this route was $244.

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7:28 pm - 9:59 amSEA-BWI

11h 31m2 stops

6:35 pm - 12:59 amBWI-SEA

9h 24m1 stop

$244United Airlines

Find Deal

Tue, Nov 4 - Mon, Nov 10

10:51 am - 9:17 amSEA-BWI

19h 26m2 stops

8:48 pm - 8:46 amBWI-SEA

14h 58m1 stop

$245Multiple Airlines

Find Deal

Sun, Dec 7 - Sun, Dec 14

10:09 am - 6:16 pmSEA-BWI

5h 07mnonstop

7:16 pm - 10:15 pmBWI-SEA

5h 59mnonstop

$246Hawaiian Airlines

Find Deal

Wed, Dec 3 - Tue, Dec 9

3:47 pm - 9:49 amSEA-IAD

15h 02m1 stop

7:00 am - 10:04 amIAD-SEA

6h 04mnonstop

$252Delta

Find Deal

Wed, Dec 24 - Mon, Jan 5

1:37 pm - 1:02 pmSEA-DCA

20h 25m1 stop

2:00 pm - 11:57 amDCA-SEA

24h 57m1 stop

$252Frontier

Find Deal

Wed, Nov 5 - Sat, Nov 8

1:56 pm - 9:59 pmSEA-DCA

5h 03mnonstop

8:00 am - 11:11 amDCA-SEA

6h 11mnonstop

$253Hawaiian Airlines

Find Deal

Wed, Dec 3 - Tue, Dec 9

10:09 am - 6:16 pmSEA-BWI

5h 07mnonstop

7:00 am - 10:02 amBWI-SEA

6h 02mnonstop

$257Alaska Airlines

Find Deal

Wed, Dec 3 - Sat, Dec 6

7:20 am - 9:02 pmSEA-DCA

10h 42m1 stop

8:59 am - 5:27 pmDCA-SEA

11h 28m1 stop

$257Alaska Airlines

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Wed, Dec 3 - Sat, Dec 13

4:59 pm - 12:54 amSEA-IAD

4h 55mnonstop

7:15 am - 10:19 amIAD-SEA

6h 04mnonstop

$257Delta

Find Deal

Thu, Nov 13 - Wed, Nov 19

2:25 pm - 12:05 pmSEA-DCA

18h 40m2 stops

6:00 pm - 11:53 amDCA-SEA

20h 53m1 stop

$262Frontier

Find Deal

Thu, Dec 4 - Sat, Dec 6

Southwest flights from Seattle to Washington, D.C.

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

Southwest

Nov 4

SEA6:15 amSeattle/Tacoma Intl

10h 30m

1 stop

BWI7:45 pmBaltimore/Washington

Nov 5

BWI7:00 amBaltimore/Washington

16h 40m

2 stops

SEA8:40 pmSeattle/Tacoma Intl

$250

Find similar

Southwest

Dec 7

SEA6:45 pmSeattle/Tacoma Intl

8h 00m

1 stop

BWI5:45 amBaltimore/Washington

Dec 10

BWI4:30 pmBaltimore/Washington

9h 00m

1 stop

SEA10:30 pmSeattle/Tacoma Intl

$256

Find similar

Southwest

Jan 15

SEA6:35 amSeattle/Tacoma Intl

8h 05m

2 stops

BWI5:40 pmBaltimore/Washington

Jan 23

BWI2:40 pmBaltimore/Washington

10h 50m

2 stops

SEA10:30 pmSeattle/Tacoma Intl

$260

Find similar

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

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

American Airlines

Feb 17

SEA10:51 pmSeattle/Tacoma Intl

6h 32m

1 stop

BWI8:23 amBaltimore/Washington

Feb 20

BWI2:12 pmBaltimore/Washington

9h 48m

1 stop

SEA9:00 pmSeattle/Tacoma Intl

$247

Find similar

American Airlines

Nov 5

SEA6:19 amSeattle/Tacoma Intl

9h 09m

1 stop

BWI6:28 pmBaltimore/Washington

Nov 12

BWI5:10 pmBaltimore/Washington

9h 08m

1 stop

SEA11:18 pmSeattle/Tacoma Intl

$249

Find similar

American Airlines

Nov 12

SEA12:59 amSeattle/Tacoma Intl

7h 01m

1 stop

DCA11:00 amWashington, D.C. Reagan-National

Nov 19

DCA1:44 pmWashington, D.C. Reagan-National

8h 06m

1 stop

SEA6:50 pmSeattle/Tacoma Intl

$254

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Fly from

Fly to

Route

Depart

Return

Price

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 11/4

7:28 pm-9:59 am

2 stops11h 31m

Baltimore/Washington

Mon 11/10

6:35 pm-12:59 am

1 stop9h 24m

$244

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Sun 12/7

10:51 am-9:17 am

2 stops19h 26m

Baltimore/Washington

Sun 12/14

8:48 pm-8:46 am

1 stop14h 58m

$245

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 12/3

10:09 am-6:16 pm

Nonstop5h 07m

Baltimore/Washington

Tue 12/9

7:16 pm-10:15 pm

Nonstop5h 59m

$246

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 12/24

3:47 pm-9:49 am

1 stop15h 02m

Washington, D.C. Dulles Intl

Mon 1/5

7:00 am-10:04 am

Nonstop6h 04m

$252

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 11/5

1:37 pm-1:02 pm

1 stop20h 25m

Washington, D.C. Reagan-National

Sat 11/8

2:00 pm-11:57 am

1 stop24h 57m

$252

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 12/3

1:56 pm-9:59 pm

Nonstop5h 03m

Washington, D.C. Reagan-National

Tue 12/9

8:00 am-11:11 am

Nonstop6h 11m

$253

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 12/3

10:09 am-6:16 pm

Nonstop5h 07m

Baltimore/Washington

Sat 12/6

7:00 am-10:02 am

Nonstop6h 02m

$257

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 12/3

7:20 am-9:02 pm

1 stop10h 42m

Washington, D.C. Reagan-National

Sat 12/13

8:59 am-5:27 pm

1 stop11h 28m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 11/13

4:59 pm-12:54 am

Nonstop4h 55m

Washington, D.C. Dulles Intl

Wed 11/19

7:15 am-10:19 am

Nonstop6h 04m

$257

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 12/4

2:25 pm-12:05 pm

2 stops18h 40m

Washington, D.C. Reagan-National

Sat 12/6

6:00 pm-11:53 am

1 stop20h 53m

$262

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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 typical price of a round-trip flight between Seattle and Washington, D.C.?

What is the cheapest month to fly to Washington, D.C.?

The month of August is, on average, the cheapest month to fly to Washington, D.C. from Seattle, with most prices found around $347. If you’re not able to fly to Washington, D.C. in August, then July is your next best option. Flight prices from Seattle to Washington, D.C. during July average around $353.

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 Wednesday. momondo users have found tickets for Wednesday 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 $590.

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 $361. 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 $505. 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 Washington, D.C. Dulles Intl 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 $404 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 $324 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 25% 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 October 2025, prices for Seattle to Washington, D.C. flights are approximately 11% 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	$188
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 $188. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $308.

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)

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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 54m 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 October 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 737-800 Passenger/BBJ2 (winglets), making up 27.73% of the total bookings. Other popular models include Boeing 737 MAX 9 with 25.15%, Boeing 737 with 12.63%, and Boeing 737-900 Passenger/BBJ3 (winglets) with 11.84%.
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 25%, United Airlines at 18%, 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 5.8 3,128 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $130	Free Cancellation	Rating 6.3 8,098 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $143	Free Cancellation	Rating 7.8 2,788 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $188	Free Cancellation	Rating 7.9 7,981 reviews	Search Delta flights
American Airlines	PriceFrom $206	Free Cancellation	Rating 7.2 11,028 reviews	Search American Airlines flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 8,991 reviews	Search United Airlines flights
Southwest	PriceFrom $266	Free Cancellation	Rating 8.0 4,237 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $277	Free Cancellation	Rating 8.0 11,155 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 12 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to Washington, D.C. starts from $277 round-trip, up to an average price of $470. Our users have rated Alaska Airlines at 8.0/10.
Delta Flights From Seattle to Washington, D.C.
Delta (7.9/10 from 7,981 reviews) operates around 14 flights from Seattle to Washington, D.C. in any given week. The average Delta airfare for this route is around $386, with deals from around $188 rare but found on momondo. Referenced prices are for round-trip Seattle to Washington, D.C. flight searches in the last 72 hours.

Alexandria

National Harbor

Gettysburg

Arlington

Woodbridge

Waldorf

Tysons

Laurel

Colonial Beach

Silver Spring

Fredericksburg

Towson

Rockville

Manassas

Reston

Fairfax

Gaithersburg

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.

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Cheap flights from Seattle to Washington, D.C. from $64

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 1/7. 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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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 typical price of a round-trip flight between Seattle and Washington, D.C.?

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 Washington, D.C. Dulles Intl 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 25% 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 October 2025, prices for Seattle to Washington, D.C. flights are approximately 11% more expensive 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.?

Southwest, American Airlines, and United Airlines 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: 31% 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 Chicago (ORD) offer the lowest average round-trip price of $198.

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?

21 flights are operational daily from Seattle to Washington, D.C. as of October 2025. The most popular departure time for this route is 1:00PM, with 44% of flights per day taking off at noon.

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

As of October 2025, 147 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 32% 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

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

Delta 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.