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

Delta and United Airlines 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 (MDW) have the shortest average one-way travel time: 8h 10m.

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 $189.

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 43m 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.

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

As of November 2025, 29 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 49% 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 209 flights per week flying from Washington, D.C. to Seattle. The most common day of the week flights depart is Mon, with 18% of flights taking off on this day.

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

Denver (DEN) was the most common stop: 81% of momondo users choosing 1-stop flights on this route connected there.

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

Atlanta (ATL) has the shortest average layover time for this route: 1h 15m.

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.

$94 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 $353 to $631. The lowest price recently found on this route was $228.

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

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One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:06 pm - 12:24 amBWI-SEA

8h 18m1 stop

6:00 am - 6:11 pmSEA-BWI

9h 11m1 stop

$228Delta

Find Deal

lun., dic. 8 - mar., dic. 16

2:30 pm - 11:05 pmBWI-SEA

11h 35m2 stops

6:35 am - 5:40 pmSEA-BWI

8h 05m2 stops

$229Southwest

Find Deal

mié., ene. 7 - jue., ene. 15

9:17 am - 7:18 pmBWI-SEA

13h 01m2 stops

9:45 pm - 10:19 amSEA-BWI

9h 34m1 stop

$233American Airlines

Find Deal

vie., ene. 9 - lun., ene. 12

6:15 am - 12:24 pmBWI-SEA

9h 09m1 stop

5:00 pm - 7:01 amSEA-BWI

11h 01m1 stop

$234United Airlines

Find Deal

dom., may. 24 - dom., may. 31

8:48 pm - 8:46 amBWI-SEA

14h 58m1 stop

12:19 pm - 7:50 pmSEA-BWI

28h 31m2 stops

$235Frontier

Find Deal

dom., dic. 14 - jue., ene. 15

5:01 pm - 8:07 pmDCA-SEA

6h 06mnonstop

1:55 pm - 9:59 pmSEA-DCA

5h 04mnonstop

$237Alaska Airlines

Find Deal

lun., ene. 26 - vie., ene. 30

7:05 am - 10:05 amIAD-SEA

6h 00mnonstop

9:27 am - 5:20 pmSEA-IAD

4h 53mnonstop

$238Alaska Airlines

Find Deal

sáb., feb. 28 - mié., mar. 4

5:55 pm - 8:57 pmIAD-SEA

6h 02mnonstop

8:10 am - 4:16 pmSEA-IAD

5h 06mnonstop

$240United Airlines

Find Deal

vie., ene. 16 - lun., ene. 19

6:43 am - 12:33 pmBWI-SEA

8h 50m1 stop

12:59 am - 2:30 pmSEA-BWI

10h 31m1 stop

$246American Airlines

Find Deal

mié., feb. 18 - vie., feb. 20

6:00 pm - 1:34 pmDCA-SEA

22h 34m1 stop

12:26 pm - 4:59 pmSEA-DCA

25h 33m1 stop

$252Frontier

Find Deal

vie., ene. 9 - dom., ene. 11

Delta flights from Washington, D.C. to Seattle

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

Delta

Dec 8

BWI7:06 pmBaltimore/Washington

8h 18m

1 stop

SEA12:24 amSeattle/Tacoma Intl

Dec 16

SEA6:00 amSeattle/Tacoma Intl

9h 11m

1 stop

BWI6:11 pmBaltimore/Washington

$228

Find similar

Delta

Jan 7

IAD7:30 amWashington, D.C. Dulles Intl

5h 59m

SEA10:29 amSeattle/Tacoma Intl

Jan 9

SEA3:20 pmSeattle/Tacoma Intl

4h 50m

IAD11:10 pmWashington, D.C. Dulles Intl

$239

Find similar

Delta

Jan 8

DCA4:44 pmWashington, D.C. Reagan-National

5h 59m

SEA7:43 pmSeattle/Tacoma Intl

Jan 14

SEA7:20 amSeattle/Tacoma Intl

5h 00m

DCA3:20 pmWashington, D.C. Reagan-National

$241

Find similar

Southwest flights from Washington, D.C. to Seattle

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

Southwest

Jan 7

BWI2:30 pmBaltimore/Washington

11h 35m

2 stops

SEA11:05 pmSeattle/Tacoma Intl

Jan 15

SEA6:35 amSeattle/Tacoma Intl

8h 05m

2 stops

BWI5:40 pmBaltimore/Washington

$229

Find similar

Southwest

Jan 9

BWI12:25 pmBaltimore/Washington

13h 40m

1 stop

SEA11:05 pmSeattle/Tacoma Intl

Jan 11

SEA6:35 amSeattle/Tacoma Intl

8h 05m

2 stops

BWI5:40 pmBaltimore/Washington

$230

Find similar

Southwest

Jan 29

BWI2:40 pmBaltimore/Washington

10h 50m

2 stops

SEA10:30 pmSeattle/Tacoma Intl

Feb 2

SEA6:25 amSeattle/Tacoma Intl

10h 25m

1 stop

BWI7:50 pmBaltimore/Washington

$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

lun. 12/8

7:06 pm-12:24 am

1 stop8h 18m

Seattle/Tacoma Intl

mar. 12/16

6:00 am-6:11 pm

1 stop9h 11m

$228

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

mié. 1/7

2:30 pm-11:05 pm

2 stops11h 35m

Seattle/Tacoma Intl

jue. 1/15

6:35 am-5:40 pm

2 stops8h 05m

$229

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

vie. 1/9

9:17 am-7:18 pm

2 stops13h 01m

Seattle/Tacoma Intl

lun. 1/12

9:45 pm-10:19 am

1 stop9h 34m

$233

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

dom. 5/24

6:15 am-12:24 pm

1 stop9h 09m

Seattle/Tacoma Intl

dom. 5/31

5:00 pm-7:01 am

1 stop11h 01m

$234

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

dom. 12/14

8:48 pm-8:46 am

1 stop14h 58m

Seattle/Tacoma Intl

jue. 1/15

12:19 pm-7:50 pm

2 stops28h 31m

$235

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

lun. 1/26

5:01 pm-8:07 pm

Nonstop6h 06m

Seattle/Tacoma Intl

vie. 1/30

1:55 pm-9:59 pm

Nonstop5h 04m

$237

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

sáb. 2/28

7:05 am-10:05 am

Nonstop6h 00m

Seattle/Tacoma Intl

mié. 3/4

9:27 am-5:20 pm

Nonstop4h 53m

$238

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

vie. 1/16

5:55 pm-8:57 pm

Nonstop6h 02m

Seattle/Tacoma Intl

lun. 1/19

8:10 am-4:16 pm

Nonstop5h 06m

$240

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

mié. 2/18

6:43 am-12:33 pm

1 stop8h 50m

Seattle/Tacoma Intl

vie. 2/20

12:59 am-2:30 pm

1 stop10h 31m

$246

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

vie. 1/9

6:00 pm-1:34 pm

1 stop22h 34m

Seattle/Tacoma Intl

dom. 1/11

12:26 pm-4:59 pm

1 stop25h 33m

$252

Flights are sorted by cheapest round-trip flights first.

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 February to fly from Washington, D.C., when ticket prices are also cheap, with an average price of $364.

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 $413 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 $332 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	$196
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 $196. The best round-trip flight deal from Washington, D.C. to Seattle found on momondo in the last 72 hours is $346.

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 54m 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 25.36% of all bookings. The subsequent popular models are Boeing 737 MAX 9 at 20.12%, Boeing 737 at 14.88%, and Boeing 737 MAX 8 at 11.33%.
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 3,101 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $126	Free Cancellation	Rating 6.3 8,156 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $149	Free Cancellation	Rating 7.8 2,815 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $183	Free Cancellation	Rating 7.9 8,003 reviews	Search Delta flights
American Airlines	PriceFrom $206	Free Cancellation	Rating 7.2 11,037 reviews	Search American Airlines flights
United Airlines	PriceFrom $228	Free Cancellation	Rating 7.4 9,050 reviews	Search United Airlines flights
Southwest	PriceFrom $236	Free Cancellation	Rating 8.0 4,254 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $271	Free Cancellation	Rating 8.0 11,363 reviews	Search Alaska Airlines flights
Sun Country Air	PriceFrom $313	Free Cancellation	Rating 6.9 333 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 14 times per week, with 11,360 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 $271 (round-trip), much lower than the average airfare cost of $481 for Alaska Airlines flights on this route.
Delta Flights From Washington, D.C. to Seattle
Across 8,003 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 $183 to $365. Price data is based on momondo searches in the last 72 hours.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Redmond

Tukwila

Cle Elum

Lakewood

Federal Way

Fife

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.

An easier way to manage your Seattle trip

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Cheap flights from Washington, D.C. to Seattle from $94

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 12/14. 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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Delta flights from Washington, D.C. to Seattle

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

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

momondo Fare Finder

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

See travel insights to Seattle from

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?

Delta and United Airlines 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: 81% 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 $189.

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

Flights connecting via Chicago (MDW) have the shortest average one-way travel time: 8h 10m.

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

Atlanta (ATL) has the shortest average layover time for this route: 1h 15m.

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

As of November 2025, 29 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 49% 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 209 flights per week flying from Washington, D.C. to Seattle. The most common day of the week flights depart is Mon, with 18% 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