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

Southwest, Frontier, and Sun Country Air are the most popular carriers operating from Seattle/Tacoma Intl to Washington, D.C.

Which layover airport has the shortest connection time from Seattle to Washington, D.C.?

Dallas (DFW) has the shortest average layover time for this route: 1h 02m.

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

41 flights are operational daily from Seattle to Washington, D.C. as of September 2025. The most popular departure time for this route is 9:00PM, with 42% 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 57m.

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

Flights via Detroit (DTW) offer the lowest average round-trip price of $206.

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

Denver (DEN) was the most common stop: 41% 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 September 2025, 288 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 15% of weekly flights taking off on this day.

What airlines fly to Washington, D.C.?

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Washington, D.C. from Seattle according to our data. Alaska Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 8 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C.?

Prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. are updated daily.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Washington, D.C.?

As of September 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.

$139 Cheap Flights from Seattle to Washington, D.C. in 2025/26

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Find the cheapest flights from Seattle to Washington, D.C.

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

1:02 pm - 6:35 amSEA-BWI

14h 33m1 stop

5:35 am - 8:37 pmBWI-SEA

18h 02m1 stop

$211Multiple Airlines

Find Deal

Mon, Oct 27 - Sat, Nov 1

1:02 pm - 5:44 pmSEA-BWI

25h 42m1 stop

4:09 pm - 12:13 pmBWI-SEA

23h 04m2 stops

$214Frontier

Find Deal

Thu, Oct 23 - Sun, Nov 9

5:11 pm - 7:19 amSEA-BWI

11h 08m1 stop

4:15 pm - 9:15 pmBWI-SEA

8h 00m1 stop

$222United Airlines

Find Deal

Fri, Dec 5 - Wed, Dec 10

6:00 am - 5:03 pmSEA-BWI

8h 03m1 stop

7:00 am - 2:54 pmBWI-SEA

10h 54m1 stop

$227Delta

Find Deal

Wed, Jan 7 - Sat, Jan 24

9:39 pm - 5:44 amSEA-BWI

5h 05mnonstop

6:55 pm - 9:53 pmBWI-SEA

5h 58mnonstop

$257Alaska Airlines

Find Deal

Tue, Jan 6 - Sat, Jan 24

8:00 am - 4:07 pmSEA-DCA

5h 07mnonstop

5:30 pm - 8:25 pmDCA-SEA

5h 55mnonstop

$257Alaska Airlines

Find Deal

Tue, Jan 6 - Mon, Jan 19

3:15 pm - 11:16 pmSEA-IAD

5h 01mnonstop

7:00 am - 10:04 amIAD-SEA

6h 04mnonstop

$257Delta

Find Deal

Mon, Jan 5 - Mon, Jan 19

11:25 pm - 7:33 amSEA-IAD

5h 08mnonstop

6:25 am - 9:08 amIAD-SEA

5h 43mnonstop

$261Hawaiian Airlines

Find Deal

Mon, Oct 6 - Tue, Oct 14

8:42 am - 9:30 pmSEA-BWI

9h 48m1 stop

5:20 pm - 10:30 pmBWI-SEA

8h 10m1 stop

$266United Airlines

Find Deal

Wed, Oct 15 - Wed, Oct 22

10:07 pm - 6:12 amSEA-BWI

5h 05mnonstop

7:00 am - 10:02 amBWI-SEA

6h 02mnonstop

$284Hawaiian Airlines

Find Deal

Tue, Oct 21 - Sat, Dec 6

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

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

Hawaiian Airlines

Oct 6

SEA11:25 pmSeattle/Tacoma Intl

5h 08m

IAD7:33 amWashington, D.C. Dulles Intl

Oct 14

IAD6:25 amWashington, D.C. Dulles Intl

5h 43m

SEA9:08 amSeattle/Tacoma Intl

$261

Find similar

Hawaiian Airlines

Oct 21

SEA10:07 pmSeattle/Tacoma Intl

5h 05m

BWI6:12 amBaltimore/Washington

Dec 6

BWI7:00 amBaltimore/Washington

6h 02m

SEA10:02 amSeattle/Tacoma Intl

$284

Find similar

Hawaiian Airlines

Nov 6

SEA1:52 pmSeattle/Tacoma Intl

5h 07m

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

Nov 10

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

6h 03m

SEA11:03 amSeattle/Tacoma Intl

$297

Find similar

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

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

Alaska Airlines

Jan 6

SEA9:39 pmSeattle/Tacoma Intl

5h 05m

BWI5:44 amBaltimore/Washington

Jan 24

BWI6:55 pmBaltimore/Washington

5h 58m

SEA9:53 pmSeattle/Tacoma Intl

$257

Find similar

Alaska Airlines

Jan 16

SEA5:30 amSeattle/Tacoma Intl

7h 34m

1 stop

DCA4:04 pmWashington, D.C. Reagan-National

Jan 19

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

8h 14m

1 stop

SEA10:24 pmSeattle/Tacoma Intl

$259

Find similar

Alaska Airlines

Jan 8

SEA9:55 amSeattle/Tacoma Intl

5h 00m

IAD5:55 pmWashington, D.C. Dulles Intl

Jan 18

IAD5:51 pmWashington, D.C. Dulles Intl

8h 55m

1 stop

SEA11:46 pmSeattle/Tacoma Intl

$260

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

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 10/27

1:02 pm-6:35 am

1 stop14h 33m

Baltimore/Washington

Sat 11/1

5:35 am-8:37 pm

1 stop18h 02m

$211

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 10/23

1:02 pm-5:44 pm

1 stop25h 42m

Baltimore/Washington

Sun 11/9

4:09 pm-12:13 pm

2 stops23h 04m

$214

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Fri 12/5

5:11 pm-7:19 am

1 stop11h 08m

Baltimore/Washington

Wed 12/10

4:15 pm-9:15 pm

1 stop8h 00m

$222

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 1/7

6:00 am-5:03 pm

1 stop8h 03m

Baltimore/Washington

Sat 1/24

7:00 am-2:54 pm

1 stop10h 54m

$227

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 1/6

9:39 pm-5:44 am

Nonstop5h 05m

Baltimore/Washington

Sat 1/24

6:55 pm-9:53 pm

Nonstop5h 58m

$257

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 1/6

8:00 am-4:07 pm

Nonstop5h 07m

Washington, D.C. Reagan-National

Mon 1/19

5:30 pm-8:25 pm

Nonstop5h 55m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 1/5

3:15 pm-11:16 pm

Nonstop5h 01m

Washington, D.C. Dulles Intl

Mon 1/19

7:00 am-10:04 am

Nonstop6h 04m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 10/6

11:25 pm-7:33 am

Nonstop5h 08m

Washington, D.C. Dulles Intl

Tue 10/14

6:25 am-9:08 am

Nonstop5h 43m

$261

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Wed 10/15

8:42 am-9:30 pm

1 stop9h 48m

Baltimore/Washington

Wed 10/22

5:20 pm-10:30 pm

1 stop8h 10m

$266

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 10/21

10:07 pm-6:12 am

Nonstop5h 05m

Baltimore/Washington

Sat 12/6

7:00 am-10:02 am

Nonstop6h 02m

$284

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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 March is your next best option. Flight prices from Seattle to Washington, D.C. during March average around $357.

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 $447. 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 $582.

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 $365. 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 $504. 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 Baltimore/Washington 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 $398 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 $321 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?

No. A direct flight is the cheapest option for a flight between Seattle to Washington, D.C..

How have Seattle to Washington, D.C. flight prices changed over time?

As of September 2025, prices for Seattle to Washington, D.C. flights are approximately 31% 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	$186
Fastest flight time	4h 52m
Direct flights	Every day
Airports in Washington, D.C.	3 airports

The best one-way flight to Washington, D.C. from Seattle in the past 72 hours is $186. The best round-trip flight deal from Seattle to Washington, D.C. found on momondo in the last 72 hours is $297.

The fastest flight from Seattle to Washington, D.C. takes 4h 52m

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

There are 3 airports near Washington, D.C.: Washington, D.C. Reagan-National (DCA), Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)

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 52m 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 September 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 26.09% of the total bookings. Other popular models include Boeing 737 MAX 9 with 24.95%, Boeing 737-900 Passenger/BBJ3 (winglets) with 13.80%, and Boeing 737 with 11.62%.
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 44% of all bookings. The subsequent popular airlines are Delta at 25%, United Airlines at 19%, and Frontier at 6%.

Best airlines flying from Seattle to Washington, D.C.

Compare and see reviews for airlines that fly from Seattle to Washington, D.C. with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $130	Free Cancellation	Rating 5.8 3,173 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $130	Free Cancellation	Rating 6.3 8,023 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $143	Free Cancellation	Rating 7.8 2,729 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $206	Free Cancellation	Rating 7.9 7,961 reviews	Search Delta flights
American Airlines	PriceFrom $206	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Southwest	PriceFrom $247	Free Cancellation	Rating 8.0 4,242 reviews	Search Southwest flights
United Airlines	PriceFrom $261	Free Cancellation	Rating 7.4 8,926 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $268	Free Cancellation	Rating 8.0 10,000 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 33 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to Washington, D.C. starts from $268 round-trip, up to an average price of $474. Our users have rated Alaska Airlines at 8.0/10.
Delta Flights From Seattle to Washington, D.C.
Delta (7.9/10 from 7,961 reviews) operates around 14 flights from Seattle to Washington, D.C. in any given week. The average Delta airfare for this route is around $393, with deals from around $206 rare but found on momondo. Referenced prices are for round-trip Seattle to Washington, D.C. flight searches in the last 72 hours.

Alexandria

Gettysburg

National Harbor

Arlington

Woodbridge

Waldorf

Tysons

Laurel

Colonial Beach

Silver Spring

Fredericksburg

Towson

Rockville

Manassas

Reston

Fairfax

Glen Burnie

Gaithersburg

Springfield

Linthicum Heights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Washington, D.C.?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Washington, D.C. from Seattle.

Can I find flights from Seattle to Washington, D.C. with flexible booking policies on momondo?

Flights from Seattle to Washington, D.C. with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Seattle to Washington, D.C.?

Once you have performed a search for Seattle to Washington, D.C. flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Seattle to Washington, D.C. right now. Can momondo alert me if prices change?

Price alerts on flights to Washington, D.C. from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Washington, D.C. trip

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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 $139

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 1/2. 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.

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

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

Our best Alaska Airlines 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.

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the 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 Baltimore/Washington 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?

No. A direct flight is the cheapest option for a flight between Seattle to Washington, D.C..

How have Seattle to Washington, D.C. flight prices changed over time?

As of September 2025, prices for Seattle to Washington, D.C. flights are approximately 31% 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.?

Southwest, Frontier, and Sun Country Air 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: 41% 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 Detroit (DTW) offer the lowest average round-trip price of $206.

Which layover airport has the shortest travel time from Seattle to Washington, D.C.?

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 6h 57m.

Which layover airport has the shortest connection time from Seattle to Washington, D.C.?

Dallas (DFW) has the shortest average layover time for this route: 1h 02m.

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

41 flights are operational daily from Seattle to Washington, D.C. as of September 2025. The most popular departure time for this route is 9:00PM, with 42% of flights per day taking off at noon.

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

As of September 2025, 288 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 15% 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