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

As of December 2025, 81 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Wed, with 37% of weekly flights taking off on this day.

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 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 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 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.

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

11 flights are operational daily from Seattle to Washington, D.C. as of December 2025. The most popular departure time for this route is 8:00AM, with 58% of flights per day taking off at noon.

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.

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 December 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.

$84 Cheap Flights from Seattle to Washington, D.C. in 2025/26

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One-way

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10:06 am - 5:00 pm

SEA

DCA

27h 54m2 stops

8:00 am - 12:01 pm

DCA

SEA

31h 01m1 stop

$207Frontier

Fri, Feb 13 - Wed, Feb 18

12:00 pm - 11:26 pm

SEA

DCA

8h 26m1 stop

4:44 pm - 7:43 pm

DCA

SEA

5h 59mnonstop

$209Delta

Tue, Feb 10 - Wed, Feb 18

6:05 am - 4:46 pm

SEA

IAD

7h 41m1 stop

7:30 am - 10:29 am

IAD

SEA

5h 59mnonstop

$209Delta

Tue, Feb 10 - Thu, Feb 19

7:15 am - 9:00 pm

SEA

DCA

10h 45m1 stop

6:56 pm - 11:21 am

DCA

SEA

19h 25m1 stop

$218Alaska Airlines

Wed, Jan 21 - Mon, Jan 26

8:10 am - 4:16 pm

SEA

IAD

5h 06mnonstop

5:55 pm - 8:56 pm

IAD

SEA

6h 01mnonstop

$218United Airlines

Fri, Feb 6 - Sat, Feb 14

1:55 pm - 9:59 pm

SEA

DCA

5h 04mnonstop

5:01 pm - 8:07 pm

DCA

SEA

6h 06mnonstop

$224Alaska Airlines

Wed, Jan 7 - Wed, Jan 14

7:00 am - 5:35 pm

SEA

IAD

7h 35m1 stop

5:55 pm - 8:56 pm

IAD

SEA

6h 01mnonstop

$228United Airlines

Fri, Feb 6 - Sun, Feb 15

12:45 pm - 11:21 pm

SEA

BWI

7h 36m1 stop

2:46 pm - 11:51 pm

BWI

SEA

12h 05m2 stops

$244American Airlines

Fri, Jan 23 - Mon, Jan 26

10:11 am - 6:14 pm

SEA

BWI

5h 03mnonstop

7:14 pm - 10:14 pm

BWI

SEA

6h 00mnonstop

$247Hawaiian Airlines

Fri, Jan 9 - Sat, Jan 17

10:11 am - 6:14 pm

SEA

BWI

5h 03mnonstop

7:14 pm - 10:14 pm

BWI

SEA

6h 00mnonstop

$248Hawaiian Airlines

Fri, Jan 9 - Sat, Jan 17

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 6

SEA8:10 amSeattle/Tacoma Intl

5h 06m

IAD4:16 pmWashington, D.C. Dulles Intl

Feb 14

IAD5:55 pmWashington, D.C. Dulles Intl

6h 01m

SEA8:56 pmSeattle/Tacoma Intl

$218

Find similar

United Airlines

Feb 6

SEA7:00 amSeattle/Tacoma Intl

7h 35m

1 stop

IAD5:35 pmWashington, D.C. Dulles Intl

Feb 15

IAD5:55 pmWashington, D.C. Dulles Intl

6h 01m

SEA8:56 pmSeattle/Tacoma Intl

$228

Find similar

United Airlines

Jan 7

SEA10:58 amSeattle/Tacoma Intl

7h 19m

1 stop

IAD9:17 pmWashington, D.C. Dulles Intl

Jan 11

IAD5:17 pmWashington, D.C. Dulles Intl

8h 26m

1 stop

SEA10:43 pmSeattle/Tacoma Intl

$233

Find similar

Southwest flights from Seattle to Washington, D.C.

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

Southwest

Feb 10

SEA9:55 amSeattle/Tacoma Intl

9h 00m

1 stop

IAD9:55 pmWashington, D.C. Dulles Intl

Feb 13

IAD5:10 amWashington, D.C. Dulles Intl

8h 10m

1 stop

SEA10:20 amSeattle/Tacoma Intl

$268

Find similar

Southwest

Jan 6

SEA6:05 amSeattle/Tacoma Intl

8h 10m

2 stops

BWI5:15 pmBaltimore/Washington

Jan 13

BWI1:45 pmBaltimore/Washington

12h 20m

2 stops

SEA11:05 pmSeattle/Tacoma Intl

$269

Find similar

Southwest

Jan 17

SEA10:20 amSeattle/Tacoma Intl

9h 00m

1 stop

BWI10:20 pmBaltimore/Washington

Jan 24

BWI12:30 pmBaltimore/Washington

11h 35m

2 stops

SEA9:05 pmSeattle/Tacoma Intl

$273

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Fri 2/13

10:06 am-5:00 pm

2 stops27h 54m

Washington, D.C. Reagan-National

Wed 2/18

8:00 am-12:01 pm

1 stop31h 01m

$207

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 2/10

12:00 pm-11:26 pm

1 stop8h 26m

Washington, D.C. Reagan-National

Wed 2/18

4:44 pm-7:43 pm

Nonstop5h 59m

$209

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 2/10

6:05 am-4:46 pm

1 stop7h 41m

Washington, D.C. Dulles Intl

Thu 2/19

7:30 am-10:29 am

Nonstop5h 59m

$209

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 1/21

7:15 am-9:00 pm

1 stop10h 45m

Washington, D.C. Reagan-National

Mon 1/26

6:56 pm-11:21 am

1 stop19h 25m

$218

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 2/6

8:10 am-4:16 pm

Nonstop5h 06m

Washington, D.C. Dulles Intl

Sat 2/14

5:55 pm-8:56 pm

Nonstop6h 01m

$218

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 1/7

1:55 pm-9:59 pm

Nonstop5h 04m

Washington, D.C. Reagan-National

Wed 1/14

5:01 pm-8:07 pm

Nonstop6h 06m

$224

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 2/6

7:00 am-5:35 pm

1 stop7h 35m

Washington, D.C. Dulles Intl

Sun 2/15

5:55 pm-8:56 pm

Nonstop6h 01m

$228

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 1/23

12:45 pm-11:21 pm

1 stop7h 36m

Baltimore/Washington

Mon 1/26

2:46 pm-11:51 pm

2 stops12h 05m

$244

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 1/9

10:11 am-6:14 pm

Nonstop5h 03m

Baltimore/Washington

Sat 1/17

7:14 pm-10:14 pm

Nonstop6h 00m

$247

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 1/9

10:11 am-6:14 pm

Nonstop5h 03m

Baltimore/Washington

Sat 1/17

7:14 pm-10:14 pm

Nonstop6h 00m

$248

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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 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 $425. 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 $578.

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 $338. 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 $494. 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 $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 $289 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 4% 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 December 2025, prices for Seattle to Washington, D.C. flights are approximately 14% 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	$188
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 $188. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $282.

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).

Search flight deals

How far is Seattle/Tacoma Intl to Washington, D.C. by plane?
There are 2320.5 mi between Seattle/Tacoma Intl and Washington, D.C.. 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 December 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 26.39% of the total bookings. Other popular models include Boeing 737 MAX 9 with 18.31%, Boeing 737 with 15.62%, and Boeing 737 MAX 8 with 10.24%.
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 26%, United Airlines at 15%, 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 $128	Free Cancellation	Rating 6.3 8,189 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $143	Free Cancellation	Rating 7.8 2,820 reviews	Search Hawaiian Airlines flights
Frontier	PriceFrom $148	Free Cancellation	Rating 5.8 3,081 reviews	Search Frontier flights
Delta	PriceFrom $188	Free Cancellation	Rating 7.9 8,009 reviews	Search Delta flights
American Airlines	PriceFrom $206	Free Cancellation	Rating 7.2 11,054 reviews	Search American Airlines flights
United Airlines	PriceFrom $218	Free Cancellation	Rating 7.4 9,093 reviews	Search United Airlines flights
Southwest	PriceFrom $234	Free Cancellation	Rating 7.9 4,250 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $263	Free Cancellation	Rating 8.0 11,479 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 5 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to Washington, D.C. starts from $263 round-trip, up to an average price of $466. Our users have rated Alaska Airlines at 8.0/10.
Delta Flights From Seattle to Washington, D.C.
Delta (7.9/10 from 8,006 reviews) operates around 10 flights from Seattle to Washington, D.C. in any given week. The average Delta airfare for this route is around $383, 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

Gaithersburg

Reston

Manassas

Fairfax

Glen Burnie

Linthicum Heights

Bethesda

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

Popular cities in the United States

Flights to New Yorkfrom $45

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Flights to Chicagofrom $58

Flights to Orlandofrom $40

Flights to San Franciscofrom $58

Flights to Las Vegasfrom $49

Flights to Bostonfrom $51

Flights to Atlantafrom $46

Flights to Dallasfrom $57

Flights to Seattlefrom $58

Flights to Denverfrom $53

Cheap flights from Seattle to Washington, D.C. from $84

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 1/17. 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.

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

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

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

See travel insights to Washington, D.C. from

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 4% 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 December 2025, prices for Seattle to Washington, D.C. flights are approximately 14% 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: 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 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?

11 flights are operational daily from Seattle to Washington, D.C. as of December 2025. 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 December 2025, 81 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Wed, with 37% 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.