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

Denver (DEN) was the most common stop: 70% of momondo users choosing 1-stop flights on this route connected there.

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

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

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

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 7h 46m.

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

Chicago (ORD) has the shortest average layover time for this route: 0h 40m.

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

As of November 2025, there are 220 flights per week flying from Washington, D.C. to Seattle. The most common day of the week flights depart is Mon, with 15% of flights taking off on this day.

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

As of November 2025, 31 flights take off from Washington, D.C. and land in Seattle each day. The most common flight departure time for this route is 7:00AM, with 47% of daily flights taking off at noon.

What airlines fly to Seattle?

Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to Seattle from Washington, D.C. 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 Seattle. Keep in mind that there are 9 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

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

Flights via Denver (DEN) offer the lowest average round-trip price of $172.

How long does it take to fly to Seattle?

Flight times vary depending on what airport in Washington, D.C. you fly out of and what airport in Seattle you fly into. For example, flying from Washington, D.C. to Seattle takes 5h 44m on average. On the other hand, flying from Baltimore to Seattle takes 5h 51m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

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

Prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport were last updated today.

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

The number of operators available for flights from Washington, D.C. to Seattle/Tacoma Intl Airport is 9 as of November 2025.

How old do you have to be to fly from Washington, D.C. to Seattle/Tacoma Intl Airport?

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 Washington, D.C. to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$95 Cheap Flights from Washington, D.C. to Seattle in 2025/26

Q: What is the typical price of a round-trip flight between Washington, D.C. and Seattle?

Prices are currently low for flights on this route. Typical prices usually range from $277 to $537. The lowest price recently found on this route was $232.

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Enter your travel dates to find the best prices.

10:27 am - 8:46 amBWI-SEA

25h 19m1 stop

12:48 pm - 7:43 pmSEA-BWI

27h 55m2 stops

$232Multiple Airlines

Find Deal

Thu, Dec 4 - Sun, Dec 7

6:00 am - 3:34 pmBWI-SEA

12h 34m2 stops

2:04 pm - 11:52 pmSEA-BWI

6h 48m1 stop

$233American Airlines

Find Deal

Wed, Feb 4 - Sun, Feb 8

7:00 am - 10:02 amBWI-SEA

6h 02mnonstop

9:38 pm - 5:40 amSEA-BWI

5h 02mnonstop

$237Alaska Airlines

Find Deal

Wed, Dec 3 - Wed, Dec 10

5:06 pm - 10:18 pmDCA-SEA

8h 12m1 stop

6:10 am - 8:00 pmSEA-DCA

10h 50m1 stop

$237Alaska Airlines

Find Deal

Sun, Feb 15 - Fri, Feb 20

7:30 am - 10:29 amIAD-SEA

5h 59mnonstop

3:20 pm - 11:10 pmSEA-IAD

4h 50mnonstop

$237Delta

Find Deal

Fri, Jan 30 - Mon, Feb 2

3:38 pm - 11:59 pmIAD-SEA

11h 21m1 stop

1:47 pm - 12:02 amSEA-IAD

7h 15m1 stop

$239Delta

Find Deal

Thu, Dec 4 - Sat, Dec 6

5:55 pm - 8:54 pmIAD-SEA

5h 59mnonstop

8:10 am - 4:18 pmSEA-IAD

5h 08mnonstop

$240United Airlines

Find Deal

Sat, Dec 6 - Sat, Dec 13

6:00 pm - 12:50 amIAD-SEA

9h 50m1 stop

8:10 am - 4:18 pmSEA-IAD

5h 08mnonstop

$241United Airlines

Find Deal

Wed, Dec 3 - Wed, Dec 17

7:00 am - 10:02 amBWI-SEA

6h 02mnonstop

10:09 am - 6:16 pmSEA-BWI

5h 07mnonstop

$246Hawaiian Airlines

Find Deal

Wed, Dec 3 - Tue, Dec 9

7:00 am - 10:02 amBWI-SEA

6h 02mnonstop

10:09 am - 6:16 pmSEA-BWI

5h 07mnonstop

$247Hawaiian Airlines

Find Deal

Wed, Dec 10 - Tue, Dec 16

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

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

American Airlines

Feb 4

BWI6:00 amBaltimore/Washington

12h 34m

2 stops

SEA3:34 pmSeattle/Tacoma Intl

Feb 8

SEA2:04 pmSeattle/Tacoma Intl

6h 48m

1 stop

BWI11:52 pmBaltimore/Washington

$233

Find similar

American Airlines

Dec 9

BWI11:09 amBaltimore/Washington

10h 46m

2 stops

SEA6:55 pmSeattle/Tacoma Intl

Dec 16

SEA5:18 amSeattle/Tacoma Intl

10h 11m

2 stops

BWI6:29 pmBaltimore/Washington

$238

Find similar

American Airlines

Jan 19

BWI11:13 amBaltimore/Washington

10h 51m

1 stop

SEA7:04 pmSeattle/Tacoma Intl

Jan 26

SEA12:45 pmSeattle/Tacoma Intl

7h 36m

1 stop

BWI11:21 pmBaltimore/Washington

$248

Find similar

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

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

Alaska Airlines

Dec 3

BWI7:00 amBaltimore/Washington

6h 02m

SEA10:02 amSeattle/Tacoma Intl

Dec 10

SEA9:38 pmSeattle/Tacoma Intl

5h 02m

BWI5:40 amBaltimore/Washington

$237

Find similar

Alaska Airlines

Dec 3

IAD7:34 amWashington, D.C. Dulles Intl

6h 01m

SEA10:35 amSeattle/Tacoma Intl

Dec 11

SEA10:11 pmSeattle/Tacoma Intl

4h 55m

IAD6:06 amWashington, D.C. Dulles Intl

$238

Find similar

Alaska Airlines

Dec 17

IAD7:34 amWashington, D.C. Dulles Intl

6h 01m

SEA10:35 amSeattle/Tacoma Intl

Jan 24

SEA8:30 amSeattle/Tacoma Intl

4h 56m

IAD4:26 pmWashington, D.C. Dulles Intl

$244

Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Thu 12/4

10:27 am-8:46 am

1 stop25h 19m

Seattle/Tacoma Intl

Sun 12/7

12:48 pm-7:43 pm

2 stops27h 55m

$232

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 2/4

6:00 am-3:34 pm

2 stops12h 34m

Seattle/Tacoma Intl

Sun 2/8

2:04 pm-11:52 pm

1 stop6h 48m

$233

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 12/3

7:00 am-10:02 am

Nonstop6h 02m

Seattle/Tacoma Intl

Wed 12/10

9:38 pm-5:40 am

Nonstop5h 02m

$237

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 2/15

5:06 pm-10:18 pm

1 stop8h 12m

Seattle/Tacoma Intl

Fri 2/20

6:10 am-8:00 pm

1 stop10h 50m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Fri 1/30

7:30 am-10:29 am

Nonstop5h 59m

Seattle/Tacoma Intl

Mon 2/2

3:20 pm-11:10 pm

Nonstop4h 50m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 12/4

3:38 pm-11:59 pm

1 stop11h 21m

Seattle/Tacoma Intl

Sat 12/6

1:47 pm-12:02 am

1 stop7h 15m

$239

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 12/6

5:55 pm-8:54 pm

Nonstop5h 59m

Seattle/Tacoma Intl

Sat 12/13

8:10 am-4:18 pm

Nonstop5h 08m

$240

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 12/3

6:00 pm-12:50 am

1 stop9h 50m

Seattle/Tacoma Intl

Wed 12/17

8:10 am-4:18 pm

Nonstop5h 08m

$241

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 12/3

7:00 am-10:02 am

Nonstop6h 02m

Seattle/Tacoma Intl

Tue 12/9

10:09 am-6:16 pm

Nonstop5h 07m

$246

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 12/10

7:00 am-10:02 am

Nonstop6h 02m

Seattle/Tacoma Intl

Tue 12/16

10:09 am-6:16 pm

Nonstop5h 07m

$247

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Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Washington, D.C. to Seattle

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 Washington, D.C. and Seattle?

What is the cheapest month to fly to Seattle?

In general, September is the cheapest month to fly from Washington, D.C. to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $334. If you don’t want to visit Seattle in September, then you should wait until October to fly from Washington, D.C., when ticket prices are also cheap, with an average price of $368.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Washington, D.C. is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $438. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Washington, D.C. because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $579.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Washington, D.C. in the evening is the least expensive time of day to depart. momondo users have found prices as low as $422 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $522. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Washington, D.C. to Seattle/Tacoma Intl flight route?

Fly from Washington, D.C. Reagan-National to Seattle/Tacoma Intl for the best Washington, D.C. - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $412 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Washington, D.C. for as low as $340 on momondo.

What cabin class options are available on Washington, D.C. to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Washington, D.C. to Seattle/Tacoma Intl 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 Washington, D.C. to Seattle flights?

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

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

As of November 2025, prices for Washington, D.C. to Seattle flights are approximately 12% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Washington, D.C. to Seattle (WAS to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Seattle

Best Price Found	$179
Fastest flight time	5h 35m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Washington, D.C. in the past 72 hours is $179. The best round-trip flight deal from Washington, D.C. to Seattle found on momondo in the last 72 hours is $352.

The fastest flight from Washington, D.C. to Seattle takes 5h 35m

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

There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

Search flight deals

How far is Washington, D.C. to Seattle/Tacoma Intl by plane?
The straight-line distance from Washington, D.C. to Seattle/Tacoma Intl is 2320.5 mi. 5h 53m is a normal flight duration for this route.
When did momondo last update prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport?
Prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Washington, D.C. to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Washington, D.C. to Seattle/Tacoma Intl Airport is 9 as of November 2025.
How old do you have to be to fly from Washington, D.C. to Seattle/Tacoma Intl Airport?
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 Washington, D.C. to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Washington, D.C. to Seattle?
momondo data reveals that the most frequently booked plane model on the route from Washington, D.C. to Seattle is Boeing 737-800 Passenger/BBJ2 (winglets), representing 25.42% of all bookings. The subsequent popular models are Boeing 737 MAX 9 at 22.65%, Boeing 737 at 13.45%, and Boeing 737-900 Passenger/BBJ3 (winglets) at 11.49%.
What is the most popular airline from Washington, D.C. to Seattle?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. to Seattle is Alaska Airlines, representing 40% of all bookings. The subsequent popular airlines are Delta at 22%, United Airlines at 21%, and Hawaiian Airlines at 7%.

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

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $111	Free Cancellation	Rating 5.8 3,113 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $126	Free Cancellation	Rating 6.3 8,139 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $149	Free Cancellation	Rating 7.8 2,809 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $184	Free Cancellation	Rating 7.9 8,009 reviews	Search Delta flights
American Airlines	PriceFrom $206	Free Cancellation	Rating 7.2 11,049 reviews	Search American Airlines flights
United Airlines	PriceFrom $229	Free Cancellation	Rating 7.4 9,016 reviews	Search United Airlines flights
Southwest	PriceFrom $238	Free Cancellation	Rating 8.0 4,235 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $275	Free Cancellation	Rating 8.0 11,279 reviews	Search Alaska Airlines flights
Sun Country Air	PriceFrom $313	Free Cancellation	Rating 6.9 336 reviews	Search Sun Country Air flights

Alaska Airlines Flights From Washington, D.C. to Seattle
Alaska Airlines flies from Washington, D.C. to Seattle around 19 times per week, with 11,279 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Washington, D.C. to Seattle in the last 72 hours was $275 (round-trip), much lower than the average airfare cost of $484 for Alaska Airlines flights on this route.
Delta Flights From Washington, D.C. to Seattle
Across 8,010 Delta reviews on momondo, the average score is 7.9/10. Delta flies from Washington, D.C. to Seattle about 14 times each week, with ticket deals ranging from $184 to $363. Price data is based on momondo searches in the last 72 hours.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Redmond

Tukwila

Lakewood

Federal Way

Fife

Cle Elum

Centralia

Kirkland

Westport

Shoreline

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Seattle for you.

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

Yes. momondo allows you to filter the results for Washington, D.C. to Seattle flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Seattle from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Washington, D.C. and alert you when they change.

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Cheap flights from Washington, D.C. to Seattle from $95

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Seattle departing on 1/11. 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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American Airlines flights from Washington, D.C. to Seattle

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

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

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

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How to get the cheapest flight ticket from Washington, D.C. to Seattle

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 typical price of a round-trip flight between Washington, D.C. and Seattle?

What is the cheapest month to fly to Seattle?

What is the cheapest day to depart on your flight to Seattle?

What is the cheapest time of day to depart on your flight to Seattle?

What is the cheapest Washington, D.C. to Seattle/Tacoma Intl flight route?

Fly from Washington, D.C. Reagan-National to Seattle/Tacoma Intl for the best Washington, D.C. - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

What cabin class options are available on Washington, D.C. to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Washington, D.C. to Seattle/Tacoma Intl 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 Washington, D.C. to Seattle flights?

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

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

As of November 2025, prices for Washington, D.C. to Seattle flights are approximately 12% cheaper when compared to flights at the same time last year.

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

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

What airlines fly to Seattle?

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

Denver (DEN) was the most common stop: 70% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Denver (DEN) offer the lowest average round-trip price of $172.

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

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 7h 46m.

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

Chicago (ORD) has the shortest average layover time for this route: 0h 40m.

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

As of November 2025, 31 flights take off from Washington, D.C. and land in Seattle each day. The most common flight departure time for this route is 7:00AM, with 47% of daily flights taking off at noon.

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

As of November 2025, there are 220 flights per week flying from Washington, D.C. to Seattle. The most common day of the week flights depart is Mon, with 15% of flights taking off on this day.

How long does it take to fly to Seattle?

When to book flights from Washington, D.C. to Seattle

Cheap Washington, D.C. to Seattle (WAS to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Seattle

Best Price Found

Fastest flight time

Direct flights

Airports in Seattle

How far is Washington, D.C. to Seattle/Tacoma Intl by plane?

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

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

How old do you have to be to fly from Washington, D.C. to Seattle/Tacoma Intl Airport?

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

What is the most popular plane model from Washington, D.C. to Seattle?

What is the most popular airline from Washington, D.C. to Seattle?

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

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

Alaska Airlines Flights From Washington, D.C. to Seattle

Delta Flights From Washington, D.C. to Seattle

Traveling to a place near Seattle?

Why use momondo?

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

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

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

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

An easier way to manage your Seattle 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