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 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.

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

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

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.

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

23 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 62% 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, 164 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Tue, with 17% of weekly flights taking off on this day.

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.

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.

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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6:05 am - 4:05 pm

SEA

BWI

7h 00m

1 stop

7:45 am - 1:15 pm

BWI

SEA

8h 30m

1 stop

$179Southwest

Tue, Feb 24 - Wed, Feb 25

5:00 am - 5:55 pm

SEA

BWI

9h 55m

2 stops

5:10 pm - 10:30 pm

BWI

SEA

8h 20m

1 stop

$184Southwest

Fri, Feb 20 - Tue, Feb 24

12:00 pm - 11:47 pm

SEA

BWI

8h 47m

1 stop

7:05 am - 2:44 pm

BWI

SEA

10h 39m

1 stop

$197Delta

Thu, Feb 19 - Tue, Feb 24

1:56 pm - 9:59 pm

SEA

DCA

5h 03mnonstop

8:00 am - 10:55 am

DCA

SEA

5h 55mnonstop

$199Alaska Airlines

Wed, Feb 25 - Wed, Mar 4

3:40 pm - 11:34 pm

SEA

IAD

4h 54mnonstop

7:30 am - 10:29 am

IAD

SEA

5h 59mnonstop

$199Delta

Sat, Feb 14 - Tue, Feb 17

7:33 pm - 1:15 pm

SEA

DCA

14h 42m

2 stops

6:00 pm - 10:19 am

DCA

SEA

19h 19m

1 stop

$200Frontier

Tue, Mar 3 - Sat, Mar 7

12:25 pm - 11:21 pm

SEA

IAD

7h 56m

1 stop

5:55 pm - 8:56 pm

IAD

SEA

6h 01mnonstop

$205United Airlines

Fri, Feb 27 - Mon, Mar 2

8:30 am - 4:26 pm

SEA

IAD

4h 56mnonstop

7:05 am - 10:05 am

IAD

SEA

6h 00mnonstop

$209Alaska Airlines

Wed, Feb 11 - Mon, Feb 23

1:16 pm - 1:00 pm

SEA

DCA

20h 44m

1 stop

8:00 am - 12:01 pm

DCA

SEA

31h 01m

1 stop

$213Frontier

Thu, Feb 26 - Wed, Mar 4

12:43 pm - 11:21 pm

SEA

IAD

7h 38m

1 stop

5:55 pm - 8:56 pm

IAD

SEA

6h 01mnonstop

$215United Airlines

Thu, Feb 26 - Sun, Mar 1

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

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

Hawaiian Airlines

Feb 19

SEA8:00 amSeattle/Tacoma Intl

5h 06m

DCA4:06 pmWashington, D.C. Reagan-National

Feb 25

DCA9:59 amWashington, D.C. Reagan-National

10h 01m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$215

Hawaiian Airlines

Feb 17

SEA9:27 amSeattle/Tacoma Intl

4h 53m

IAD5:20 pmWashington, D.C. Dulles Intl

Feb 24

IAD7:05 amWashington, D.C. Dulles Intl

6h 00m

SEA10:05 amSeattle/Tacoma Intl

$230

Hawaiian Airlines

Feb 14

SEA1:56 pmSeattle/Tacoma Intl

5h 03m

DCA9:59 pmWashington, D.C. Reagan-National

Feb 20

DCA8:00 amWashington, D.C. Reagan-National

6h 10m

SEA11:10 amSeattle/Tacoma Intl

$247

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 27

SEA12:25 pmSeattle/Tacoma Intl

7h 56m

1 stop

IAD11:21 pmWashington, D.C. Dulles Intl

Mar 2

IAD5:55 pmWashington, D.C. Dulles Intl

6h 01m

SEA8:56 pmSeattle/Tacoma Intl

$205

United Airlines

Feb 26

SEA12:43 pmSeattle/Tacoma Intl

7h 38m

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

$215

United Airlines

Feb 21

SEA12:42 pmSeattle/Tacoma Intl

7h 39m

1 stop

IAD11:21 pmWashington, D.C. Dulles Intl

Feb 24

IAD1:02 pmWashington, D.C. Dulles Intl

9h 01m

1 stop

SEA7:03 pmSeattle/Tacoma Intl

$225

Fly from

Fly to

Route

Depart

Return

Price

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 2/24

6:05 am-4:05 pm

1 stop7h 00m

Baltimore/Washington

Wed 2/25

7:45 am-1:15 pm

1 stop8h 30m

$179

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 2/20

5:00 am-5:55 pm

2 stops9h 55m

Baltimore/Washington

Tue 2/24

5:10 pm-10:30 pm

1 stop8h 20m

$184

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 2/19

12:00 pm-11:47 pm

1 stop8h 47m

Baltimore/Washington

Tue 2/24

7:05 am-2:44 pm

1 stop10h 39m

$197

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 2/25

1:56 pm-9:59 pm

Nonstop5h 03m

Washington, D.C. Reagan-National

Wed 3/4

8:00 am-10:55 am

Nonstop5h 55m

$199

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 2/14

3:40 pm-11:34 pm

Nonstop4h 54m

Washington, D.C. Dulles Intl

Tue 2/17

7:30 am-10:29 am

Nonstop5h 59m

$199

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 3/3

7:33 pm-1:15 pm

2 stops14h 42m

Washington, D.C. Reagan-National

Sat 3/7

6:00 pm-10:19 am

1 stop19h 19m

$200

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 2/27

12:25 pm-11:21 pm

1 stop7h 56m

Washington, D.C. Dulles Intl

Mon 3/2

5:55 pm-8:56 pm

Nonstop6h 01m

$205

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 2/11

8:30 am-4:26 pm

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 2/23

7:05 am-10:05 am

Nonstop6h 00m

$209

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 2/26

1:16 pm-1:00 pm

1 stop20h 44m

Washington, D.C. Reagan-National

Wed 3/4

8:00 am-12:01 pm

1 stop31h 01m

$213

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

Sun 3/1

5:55 pm-8:56 pm

Nonstop6h 01m

$215

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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 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 $417. 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 $579.

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 $488. 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 16% 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	$182
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 $182. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $213.

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 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 25.36% of the total bookings. Other popular models include Boeing 737 with 16.96%, Boeing 737 MAX 9 with 14.48%, and Boeing 737 MAX 8 with 9.12%.
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
Delta	PriceFrom $103	Free Cancellation	Rating 7.9 8,087 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 2,829 reviews	Search Hawaiian Airlines flights
American Airlines	PriceFrom $178	Free Cancellation	Rating 7.2 11,173 reviews	Search American Airlines flights
United Airlines	PriceFrom $203	Free Cancellation	Rating 7.4 9,191 reviews	Search United Airlines flights
Southwest	PriceFrom $218	Free Cancellation	Rating 8.0 4,266 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $227	Free Cancellation	Rating 8.0 11,772 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 18 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to Washington, D.C. starts from $227 round-trip, up to an average price of $460. Our users have rated Alaska Airlines at 8.0/10.
Delta Flights From Seattle to Washington, D.C.
Delta (7.9/10 from 8,087 reviews) operates around 14 flights from Seattle to Washington, D.C. in any given week. The average Delta airfare for this route is around $366, 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

Rockville

Gaithersburg

Manassas

Springfield

Fairfax

Linthicum Heights

Bethesda

Glen Burnie

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 2/23. 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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How to get the cheapest flight ticket from Seattle to 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 16% 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 Alaska 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: 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?

23 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 62% 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, 164 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Tue, 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

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