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

Denver (DEN) was the most common stop: 36% of momondo users choosing 1-stop flights on this route connected there.

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

As of January 2026, 156 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Mon, with 17% of weekly flights taking off on this day.

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

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

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 7 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 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 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?

22 flights are operational daily from Seattle to Washington, D.C. as of January 2026. The most popular departure time for this route is 8:00AM, with 63% of flights per day taking off at noon.

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 54m.

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 January 2026, there are 7 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.

$85 Cheap Flights from Seattle to Washington, D.C. in 2026

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One-way

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5:15 am - 5:40 pm

SEA

BWI

9h 25m

2 stops

5:50 pm - 10:50 pm

BWI

SEA

8h 00m

1 stop

$184Southwest

Thu, Feb 19 - Sat, Feb 28

7:35 pm - 5:51 am

SEA

BWI

7h 16m

1 stop

5:40 am - 10:33 am

BWI

SEA

7h 53m

1 stop

$197Delta

Tue, Mar 31 - Tue, Apr 7

1:16 pm - 1:15 pm

SEA

DCA

20h 59m

1 stop

2:00 pm - 12:01 pm

DCA

SEA

25h 01m

1 stop

$205Frontier

Thu, Feb 19 - Wed, Feb 25

6:30 pm - 1:15 pm

SEA

DCA

39h 45m

2 stops

2:00 pm - 12:01 pm

DCA

SEA

25h 01m

1 stop

$212Frontier

Tue, Feb 17 - Wed, Feb 25

9:46 am - 5:46 pm

SEA

BWI

5h 00mnonstop

6:46 pm - 9:50 pm

BWI

SEA

6h 04mnonstop

$227Alaska Airlines

Sat, Feb 21 - Sat, Feb 28

7:15 am - 8:05 pm

SEA

DCA

9h 50m

1 stop

5:10 pm - 10:28 pm

DCA

SEA

8h 18m

1 stop

$236Hawaiian Airlines

Sat, Mar 14 - Sat, Mar 21

1:56 pm - 9:59 pm

SEA

DCA

5h 03mnonstop

8:00 am - 10:55 am

DCA

SEA

5h 55mnonstop

$237Alaska Airlines

Wed, Feb 18 - Tue, Feb 24

8:17 am - 4:19 pm

SEA

IAD

5h 02mnonstop

5:55 pm - 8:56 pm

IAD

SEA

6h 01mnonstop

$237United Airlines

Thu, Feb 26 - Thu, Mar 5

12:43 pm - 11:21 pm

SEA

IAD

7h 38m

1 stop

5:55 pm - 8:56 pm

IAD

SEA

6h 01mnonstop

$243United Airlines

Thu, Feb 26 - Thu, Mar 5

9:27 am - 5:20 pm

SEA

IAD

4h 53mnonstop

7:05 am - 10:05 am

IAD

SEA

6h 00mnonstop

$246Hawaiian Airlines

Sat, Feb 21 - Sat, Feb 28

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

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

Hawaiian Airlines

Mar 14

SEA7:15 amSeattle/Tacoma Intl

9h 50m

1 stop

DCA8:05 pmWashington, D.C. Reagan-National

Mar 21

DCA5:10 pmWashington, D.C. Reagan-National

8h 18m

1 stop

SEA10:28 pmSeattle/Tacoma Intl

$236

Hawaiian Airlines

Feb 21

SEA9:27 amSeattle/Tacoma Intl

4h 53m

IAD5:20 pmWashington, D.C. Dulles Intl

Feb 28

IAD7:05 amWashington, D.C. Dulles Intl

6h 00m

SEA10:05 amSeattle/Tacoma Intl

$246

Hawaiian Airlines

Mar 17

SEA9:27 amSeattle/Tacoma Intl

4h 53m

IAD5:20 pmWashington, D.C. Dulles Intl

Mar 24

IAD7:11 pmWashington, D.C. Dulles Intl

5h 51m

SEA10:02 pmSeattle/Tacoma Intl

$256

Delta flights from Seattle to Washington, D.C.

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

Delta

Mar 31

SEA7:35 pmSeattle/Tacoma Intl

7h 16m

1 stop

BWI5:51 amBaltimore/Washington

Apr 7

BWI11:45 amBaltimore/Washington

9h 41m

1 stop

SEA6:26 pmSeattle/Tacoma Intl

$197

Delta

Feb 10

SEA6:05 amSeattle/Tacoma Intl

7h 33m

1 stop

BWI4:38 pmBaltimore/Washington

Feb 15

BWI6:04 amBaltimore/Washington

7h 51m

1 stop

SEA10:55 amSeattle/Tacoma Intl

$217

Delta

Apr 29

SEA7:35 pmSeattle/Tacoma Intl

7h 25m

1 stop

BWI6:00 amBaltimore/Washington

May 3

BWI7:12 pmBaltimore/Washington

7h 41m

1 stop

SEA11:53 pmSeattle/Tacoma Intl

$218

Fly from

Fly to

Route

Depart

Return

Price

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 2/19

5:15 am-5:40 pm

2 stops9h 25m

Baltimore/Washington

Sat 2/28

5:50 pm-10:50 pm

1 stop8h 00m

$184

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 3/31

7:35 pm-5:51 am

1 stop7h 16m

Baltimore/Washington

Tue 4/7

5:40 am-10:33 am

1 stop7h 53m

$197

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 2/19

1:16 pm-1:15 pm

1 stop20h 59m

Washington, D.C. Reagan-National

Wed 2/25

2:00 pm-12:01 pm

1 stop25h 01m

$205

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 2/17

6:30 pm-1:15 pm

2 stops39h 45m

Washington, D.C. Reagan-National

Wed 2/25

2:00 pm-12:01 pm

1 stop25h 01m

$212

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Sat 2/21

9:46 am-5:46 pm

Nonstop5h 00m

Baltimore/Washington

Sat 2/28

6:46 pm-9:50 pm

Nonstop6h 04m

$227

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 3/14

7:15 am-8:05 pm

1 stop9h 50m

Washington, D.C. Reagan-National

Sat 3/21

5:10 pm-10:28 pm

1 stop8h 18m

$236

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 2/18

1:56 pm-9:59 pm

Nonstop5h 03m

Washington, D.C. Reagan-National

Tue 2/24

8:00 am-10:55 am

Nonstop5h 55m

$237

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 2/26

8:17 am-4:19 pm

Nonstop5h 02m

Washington, D.C. Dulles Intl

Thu 3/5

5:55 pm-8:56 pm

Nonstop6h 01m

$237

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 2/26

12:43 pm-11:21 pm

1 stop7h 38m

Washington, D.C. Dulles Intl

Thu 3/5

5:55 pm-8:56 pm

Nonstop6h 01m

$243

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 2/21

9:27 am-5:20 pm

Nonstop4h 53m

Washington, D.C. Dulles Intl

Sat 2/28

7:05 am-10:05 am

Nonstop6h 00m

$246

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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 July 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 July, then August is your next best option. Flight prices from Seattle to Washington, D.C. during August average around $347.

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 $415. 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 $576.

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 $330. 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 $487. 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. Reagan-National 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 $421 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 $315 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 January 2026, prices for Seattle to Washington, D.C. flights are approximately 17% 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	$181
Fastest flight time	4h 50m
Direct flights	Every day
Airports in Washington, D.C.	2 airports

The best one-way flight to Washington, D.C. from Seattle in the past 72 hours is $181. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $216.

The fastest flight from Seattle to Washington, D.C. takes 4h 50m

Direct flights go from Seattle to Washington, D.C. every day.

There are 2 airports in Washington, D.C.. From Seattle there are direct flights to 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 50m 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 January 2026, there are 7 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 25.53% of the total bookings. Other popular models include Boeing 737 with 17.82%, Boeing 737 MAX 9 with 13.96%, and Boeing 737-900 with 10.26%.
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 46% of all bookings. The subsequent popular airlines are Delta at 25%, United Airlines at 16%, 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
Delta	PriceFrom $103	Free Cancellation	Rating 7.9 8,127 reviews	Search Delta flights
Frontier	PriceFrom $126	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $138	Free Cancellation	Rating 7.8 2,830 reviews	Search Hawaiian Airlines flights
American Airlines	PriceFrom $178	Free Cancellation	Rating 7.2 11,206 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $200	Free Cancellation	Rating 8.0 11,807 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $203	Free Cancellation	Rating 7.4 9,215 reviews	Search United Airlines flights
Southwest	PriceFrom $218	Free Cancellation	Rating 8.0 4,267 reviews	Search Southwest 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 18 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to Washington, D.C. starts from $200 round-trip, up to an average price of $454. Our users have rated Alaska Airlines at 8.0/10.
Delta Flights From Seattle to Washington, D.C.
Delta (7.9/10 from 8,127 reviews) operates around 14 flights from Seattle to Washington, D.C. in any given week. The average Delta airfare for this route is around $362, with deals from around $103 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

Waldorf

Woodbridge

Tysons

Laurel

Colonial Beach

Silver Spring

Towson

Fredericksburg

Gaithersburg

Rockville

Manassas

Springfield

Fairfax

Linthicum Heights

Bethesda

Reston

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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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 $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 2/23. 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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Hawaiian Airlines flights from Seattle to Washington, D.C.

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Our best Delta 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.

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. Reagan-National 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 January 2026, prices for Seattle to Washington, D.C. flights are approximately 17% 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, Southwest, 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: 36% 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 54m.

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?

22 flights are operational daily from Seattle to Washington, D.C. as of January 2026. The most popular departure time for this route is 8:00AM, with 63% of flights per day taking off at noon.

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

As of January 2026, 156 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Mon, with 17% 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.

Find better results for your trip to the United States