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.

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 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.

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.

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

As of January 2026, 173 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Fri, with 16% of weekly flights taking off on this day.

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.

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

24 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 58% of flights per day taking off at noon.

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 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.

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

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One-way

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6:00 am - 6:04 pm

SEA

BWI

9h 04m

1 stop

6:59 pm - 11:40 pm

BWI

SEA

7h 41m

1 stop

$197Delta

Fri, Mar 13 - Mon, Mar 16

12:45 pm - 11:21 pm

SEA

BWI

7h 36m

1 stop

6:00 am - 12:01 pm

BWI

SEA

9h 01m

1 stop

$198American Airlines

Wed, Feb 4 - Sun, Feb 8

8:00 am - 4:09 pm

SEA

DCA

5h 09mnonstop

5:01 pm - 8:07 pm

DCA

SEA

6h 06mnonstop

$199Alaska Airlines

Sat, Jan 31 - Tue, Feb 3

9:45 pm - 5:40 am

SEA

IAD

4h 55mnonstop

6:27 pm - 9:35 pm

IAD

SEA

6h 08mnonstop

$199Alaska Airlines

Sun, Feb 15 - Mon, Mar 2

7:15 am - 7:39 pm

SEA

BWI

9h 24m

1 stop

6:40 pm - 12:24 am

BWI

SEA

8h 44m

1 stop

$199American Airlines

Thu, Feb 26 - Thu, Mar 5

12:34 pm - 1:02 pm

SEA

DCA

21h 28m

1 stop

2:00 pm - 12:01 pm

DCA

SEA

25h 01m

1 stop

$201Frontier

Sun, Feb 8 - Wed, Feb 11

9:25 pm - 1:15 pm

SEA

DCA

36h 50m

2 stops

6:00 pm - 10:55 am

DCA

SEA

19h 55m

1 stop

$202Frontier

Sun, Feb 8 - Sat, Feb 14

1:20 pm - 5:30 am

SEA

BWI

13h 10m

2 stops

7:10 pm - 1:20 am

BWI

SEA

9h 10m

1 stop

$224Southwest

Tue, Mar 3 - Sat, Mar 7

9:25 am - 8:54 pm

SEA

IAD

8h 29m

1 stop

5:17 pm - 10:43 pm

IAD

SEA

8h 26m

1 stop

$225United Airlines

Thu, Feb 5 - Mon, Feb 9

5:15 am - 5:40 pm

SEA

BWI

9h 25m

2 stops

2:10 pm - 10:50 pm

BWI

SEA

11h 40m

1 stop

$230Southwest

Fri, Feb 6 - Mon, Feb 9

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

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

United Airlines

Feb 5

SEA9:25 amSeattle/Tacoma Intl

8h 29m

1 stop

IAD8:54 pmWashington, D.C. Dulles Intl

Feb 9

IAD5:17 pmWashington, D.C. Dulles Intl

8h 26m

1 stop

SEA10:43 pmSeattle/Tacoma Intl

$225

United Airlines

Feb 15

SEA12:12 pmSeattle/Tacoma Intl

8h 09m

1 stop

IAD11:21 pmWashington, D.C. Dulles Intl

Mar 1

IAD5:55 pmWashington, D.C. Dulles Intl

6h 01m

SEA8:56 pmSeattle/Tacoma Intl

$243

United Airlines

Feb 11

SEA8:40 amSeattle/Tacoma Intl

10h 12m

2 stops

DCA9:52 pmWashington, D.C. Reagan-National

Feb 18

DCA2:00 pmWashington, D.C. Reagan-National

8h 03m

1 stop

SEA7:03 pmSeattle/Tacoma Intl

$244

Delta flights from Seattle to Washington, D.C.

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

Delta

Apr 20

SEA7:35 pmSeattle/Tacoma Intl

7h 27m

1 stop

BWI6:02 amBaltimore/Washington

Apr 25

BWI7:00 amBaltimore/Washington

10h 46m

1 stop

SEA2:46 pmSeattle/Tacoma Intl

$197

Delta

Mar 9

SEA11:15 pmSeattle/Tacoma Intl

8h 15m

1 stop

BWI10:30 amBaltimore/Washington

Mar 10

BWI5:35 pmBaltimore/Washington

7h 27m

1 stop

SEA10:02 pmSeattle/Tacoma Intl

$217

Delta

Mar 31

SEA3:55 pmSeattle/Tacoma Intl

4h 54m

IAD11:49 pmWashington, D.C. Dulles Intl

Apr 7

IAD7:00 amWashington, D.C. Dulles Intl

6h 03m

SEA10:03 amSeattle/Tacoma Intl

$218

Fly from

Fly to

Route

Depart

Return

Price

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 3/13

6:00 am-6:04 pm

1 stop9h 04m

Baltimore/Washington

Mon 3/16

6:59 pm-11:40 pm

1 stop7h 41m

$197

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 2/4

12:45 pm-11:21 pm

1 stop7h 36m

Baltimore/Washington

Sun 2/8

6:00 am-12:01 pm

1 stop9h 01m

$198

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 1/31

8:00 am-4:09 pm

Nonstop5h 09m

Washington, D.C. Reagan-National

Tue 2/3

5:01 pm-8:07 pm

Nonstop6h 06m

$199

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 2/15

9:45 pm-5:40 am

Nonstop4h 55m

Washington, D.C. Dulles Intl

Mon 3/2

6:27 pm-9:35 pm

Nonstop6h 08m

$199

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 2/26

7:15 am-7:39 pm

1 stop9h 24m

Baltimore/Washington

Thu 3/5

6:40 pm-12:24 am

1 stop8h 44m

$199

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 2/8

12:34 pm-1:02 pm

1 stop21h 28m

Washington, D.C. Reagan-National

Wed 2/11

2:00 pm-12:01 pm

1 stop25h 01m

$201

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sun 2/8

9:25 pm-1:15 pm

2 stops36h 50m

Washington, D.C. Reagan-National

Sat 2/14

6:00 pm-10:55 am

1 stop19h 55m

$202

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 3/3

1:20 pm-5:30 am

2 stops13h 10m

Baltimore/Washington

Sat 3/7

7:10 pm-1:20 am

1 stop9h 10m

$224

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 2/5

9:25 am-8:54 pm

1 stop8h 29m

Washington, D.C. Dulles Intl

Mon 2/9

5:17 pm-10:43 pm

1 stop8h 26m

$225

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 2/6

5:15 am-5:40 pm

2 stops9h 25m

Baltimore/Washington

Mon 2/9

2:10 pm-10:50 pm

1 stop11h 40m

$230

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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 $348.

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 $422. 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 $580.

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 $336. 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 $491. 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 $425 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 $328 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 18% 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	$183
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 $183. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $199.

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 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 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 25.76% of the total bookings. Other popular models include Boeing 737 with 16.12%, Boeing 737 MAX 9 with 15.37%, and Boeing 737-800 with 9.90%.
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 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
Spirit Airlines	PriceFrom $125	Free Cancellation	Rating 6.3 8,302 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $143	Free Cancellation	Rating 7.8 2,827 reviews	Search Hawaiian Airlines flights
Frontier	PriceFrom $148	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
American Airlines	PriceFrom $178	Free Cancellation	Rating 7.2 11,114 reviews	Search American Airlines flights
Delta	PriceFrom $182	Free Cancellation	Rating 7.9 8,038 reviews	Search Delta flights
Southwest	PriceFrom $218	Free Cancellation	Rating 8.0 4,256 reviews	Search Southwest flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,147 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $255	Free Cancellation	Rating 7.9 11,694 reviews	Search Alaska Airlines 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 $182 round-trip, up to an average price of $381. Our users have rated Delta at 7.9/10.
Alaska Airlines Flights From Seattle to Washington, D.C.
Alaska Airlines (7.9/10 from 11,694 reviews) operates around 20 flights from Seattle to Washington, D.C. in any given week. The average Alaska Airlines airfare for this route is around $464, with deals from around $255 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

Glen Burnie

Linthicum Heights

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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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 2/21. 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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United Airlines flights from Seattle to Washington, D.C.

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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 18% 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?

24 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 58% 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, 173 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Fri, with 16% 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