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

As of December 2025, 10 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 48% 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.

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

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

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

Denver (DEN) was the most common stop: 80% of momondo users choosing 1-stop flights on this route connected there.

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 45m 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.

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.

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

As of December 2025, there are 72 flights per week flying from Washington, D.C. to Seattle. The most common day of the week flights depart is Wed, with 42% of flights taking off on this day.

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 December 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.

$99 Cheap Flights from Washington, D.C. to Seattle in 2025/26

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Enter your travel dates to find the best prices.

7:30 am - 10:29 am

IAD

SEA

5h 59mnonstop

11:10 pm - 11:49 am

SEA

IAD

9h 39m1 stop

$209Delta

Wed, Jan 7 - Tue, Jan 13

4:44 pm - 7:43 pm

DCA

SEA

5h 59mnonstop

11:10 pm - 8:53 am

SEA

DCA

6h 43m1 stop

$209Delta

Wed, Jan 7 - Mon, Jan 12

6:00 pm - 9:04 am

DCA

SEA

18h 04m2 stops

12:26 pm - 1:01 pm

SEA

DCA

21h 35m1 stop

$210Frontier

Wed, Jan 7 - Sun, Jan 11

7:30 am - 10:29 am

IAD

SEA

5h 59mnonstop

6:15 am - 7:24 pm

SEA

IAD

10h 09m1 stop

$210Delta

Sat, Jan 10 - Sat, Jan 17

8:00 am - 12:01 pm

DCA

SEA

31h 01m1 stop

12:24 pm - 1:02 pm

SEA

DCA

21h 38m1 stop

$214Frontier

Wed, Feb 25 - Fri, Mar 6

5:55 pm - 8:57 pm

IAD

SEA

6h 02mnonstop

8:10 am - 4:16 pm

SEA

IAD

5h 06mnonstop

$216United Airlines

Tue, Jan 6 - Tue, Jan 13

6:56 pm - 9:18 am

DCA

SEA

17h 22m1 stop

7:15 am - 9:00 pm

SEA

DCA

10h 45m1 stop

$218Alaska Airlines

Thu, Jan 8 - Mon, Jan 12

5:55 pm - 8:57 pm

IAD

SEA

6h 02mnonstop

8:10 am - 4:16 pm

SEA

IAD

5h 06mnonstop

$218United Airlines

Fri, Jan 16 - Fri, Jan 23

6:04 pm - 9:08 pm

IAD

SEA

6h 04mnonstop

8:30 am - 4:26 pm

SEA

IAD

4h 56mnonstop

$230Hawaiian Airlines

Fri, Jan 30 - Fri, Feb 6

7:14 pm - 10:14 pm

BWI

SEA

6h 00mnonstop

10:11 am - 6:14 pm

SEA

BWI

5h 03mnonstop

$237Alaska Airlines

Fri, Jan 30 - Sat, Jan 31

Delta flights from Washington, D.C. to Seattle

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

Delta

Jan 7

IAD7:30 amWashington, D.C. Dulles Intl

5h 59m

SEA10:29 amSeattle/Tacoma Intl

Jan 14

SEA1:38 pmSeattle/Tacoma Intl

7h 10m

1 stop

IAD11:48 pmWashington, D.C. Dulles Intl

$209

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Delta

Jan 10

IAD7:30 amWashington, D.C. Dulles Intl

5h 59m

SEA10:29 amSeattle/Tacoma Intl

Jan 17

SEA6:15 amSeattle/Tacoma Intl

10h 09m

1 stop

IAD7:24 pmWashington, D.C. Dulles Intl

$210

Find similar

Delta

Jan 14

IAD6:00 amWashington, D.C. Dulles Intl

7h 42m

1 stop

SEA10:42 amSeattle/Tacoma Intl

Jan 21

SEA12:00 pmSeattle/Tacoma Intl

8h 57m

1 stop

IAD11:57 pmWashington, D.C. Dulles Intl

$219

Find similar

Frontier flights from Washington, D.C. to Seattle

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

Frontier

Jan 7

DCA6:00 pmWashington, D.C. Reagan-National

18h 04m

2 stops

SEA9:04 amSeattle/Tacoma Intl

Jan 11

SEA12:26 pmSeattle/Tacoma Intl

21h 35m

1 stop

DCA1:01 pmWashington, D.C. Reagan-National

$210

Find similar

Frontier

Jan 8

DCA2:00 pmWashington, D.C. Reagan-National

24h 21m

1 stop

SEA11:21 amSeattle/Tacoma Intl

Jan 11

SEA7:23 pmSeattle/Tacoma Intl

14h 38m

2 stops

DCA1:01 pmWashington, D.C. Reagan-National

$211

Find similar

Frontier

Feb 27

DCA6:00 pmWashington, D.C. Reagan-National

21h 01m

1 stop

SEA12:01 pmSeattle/Tacoma Intl

Mar 1

SEA12:34 pmSeattle/Tacoma Intl

20h 30m

1 stop

DCA12:04 pmWashington, D.C. Reagan-National

$214

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

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 1/7

7:30 am-10:29 am

Nonstop5h 59m

Seattle/Tacoma Intl

Tue 1/13

11:10 pm-11:49 am

1 stop9h 39m

$209

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 1/7

4:44 pm-7:43 pm

Nonstop5h 59m

Seattle/Tacoma Intl

Mon 1/12

11:10 pm-8:53 am

1 stop6h 43m

$209

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 1/7

6:00 pm-9:04 am

2 stops18h 04m

Seattle/Tacoma Intl

Sun 1/11

12:26 pm-1:01 pm

1 stop21h 35m

$210

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 1/10

7:30 am-10:29 am

Nonstop5h 59m

Seattle/Tacoma Intl

Sat 1/17

6:15 am-7:24 pm

1 stop10h 09m

$210

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 2/25

8:00 am-12:01 pm

1 stop31h 01m

Seattle/Tacoma Intl

Fri 3/6

12:24 pm-1:02 pm

1 stop21h 38m

$214

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 1/6

5:55 pm-8:57 pm

Nonstop6h 02m

Seattle/Tacoma Intl

Tue 1/13

8:10 am-4:16 pm

Nonstop5h 06m

$216

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 1/8

6:56 pm-9:18 am

1 stop17h 22m

Seattle/Tacoma Intl

Mon 1/12

7:15 am-9:00 pm

1 stop10h 45m

$218

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Fri 1/16

5:55 pm-8:57 pm

Nonstop6h 02m

Seattle/Tacoma Intl

Fri 1/23

8:10 am-4:16 pm

Nonstop5h 06m

$218

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Fri 1/30

6:04 pm-9:08 pm

Nonstop6h 04m

Seattle/Tacoma Intl

Fri 2/6

8:30 am-4:26 pm

Nonstop4h 56m

$230

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 1/30

7:14 pm-10:14 pm

Nonstop6h 00m

Seattle/Tacoma Intl

Sat 1/31

10:11 am-6:14 pm

Nonstop5h 03m

$237

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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

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 $329. If you don’t want to visit Seattle in September, then you should wait until November to fly from Washington, D.C., when ticket prices are also cheap, with an average price of $362.

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 $437. 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 $515. 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. Dulles Intl 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 $406 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 $322 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 December 2025, prices for Washington, D.C. to Seattle flights are approximately 2% 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	$189
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 $189. The best round-trip flight deal from Washington, D.C. to Seattle found on momondo in the last 72 hours is $312.

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 in Seattle. From Washington, D.C. there are direct flights to 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 35m 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 December 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 23.93% of all bookings. The subsequent popular models are Boeing 737 MAX 9 at 17.06%, Boeing 737 at 16.00%, and Boeing 737 MAX 8 at 10.98%.
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 3,081 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $125	Free Cancellation	Rating 6.3 8,190 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $149	Free Cancellation	Rating 7.8 2,820 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $179	Free Cancellation	Rating 7.9 8,008 reviews	Search Delta flights
American Airlines	PriceFrom $197	Free Cancellation	Rating 7.2 11,055 reviews	Search American Airlines flights
United Airlines	PriceFrom $228	Free Cancellation	Rating 7.4 9,093 reviews	Search United Airlines flights
Southwest	PriceFrom $236	Free Cancellation	Rating 7.9 4,250 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $264	Free Cancellation	Rating 8.0 11,478 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 5 times per week, with 11,478 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 $264 (round-trip), much lower than the average airfare cost of $476 for Alaska Airlines flights on this route.
Delta Flights From Washington, D.C. to Seattle
Across 8,008 Delta reviews on momondo, the average score is 7.9/10. Delta flies from Washington, D.C. to Seattle about 10 times each week, with ticket deals ranging from $179 to $363. 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

Federal Way

Lakewood

Fife

Centralia

Westport

Kirkland

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 $99

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 2/18. 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

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Our best Frontier 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

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. Dulles Intl 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 December 2025, prices for Washington, D.C. to Seattle flights are approximately 2% 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, Alaska Airlines, 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: 80% 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 December 2025, 10 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 48% of daily flights taking off at noon.

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

As of December 2025, there are 72 flights per week flying from Washington, D.C. to Seattle. The most common day of the week flights depart is Wed, with 42% 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

Daily price changes in your inbox - only with Price Alerts.