What airlines fly to Seattle?

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Seattle from Washington, D.C. Reagan-National Airport according to our data. Alaska Airlines is the first choice among our users, with 60% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 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. Reagan-National to Seattle/Tacoma Intl?

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

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

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

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

As of July 2026, there are 7 operators available to choose from for flights from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport.

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

The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$172 Cheap Flights from Washington, D.C. Reagan-National Airport to Seattle in 2026

Q: How many flights depart from Washington, D.C. Reagan-National Airport to Seattle on average per day?

4 flights are operational daily from Washington, D.C. Reagan-National Airport to Seattle as of July 2026. The most popular departure time for this route is 8:00AM, with 64% of flights per day taking off at noon.

Q: How many flights depart from Washington, D.C. Reagan-National Airport to Seattle on average per week?

29 flights are operational weekly from Washington, D.C. Reagan-National Airport to Seattle as of July 2026. The most popular departure day for this route is Fri, with 21% of flights per week taking off on this day.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington, D.C. Reagan-National Airport to Seattle

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:00 am - 10:54 am

DCA

SEA

5h 54mnonstop

4:27 pm - 9:59 pm

SEA

DCA

26h 32m

1 stop

$287Multiple Airlines

Sun, Sep 6 - Tue, Sep 15

5:00 pm - 7:51 pm

DCA

SEA

5h 51mnonstop

4:27 pm - 9:59 pm

SEA

DCA

26h 32m

1 stop

$288Multiple Airlines

Sat, Sep 5 - Thu, Sep 10

4:35 pm - 11:55 pm

DCA

SEA

10h 20m

2 stops

5:15 am - 2:50 pm

SEA

DCA

6h 35m

1 stop

$290Southwest

Mon, Sep 14 - Fri, Sep 18

6:05 am - 1:00 pm

DCA

SEA

9h 55m

2 stops

11:05 pm - 11:25 am

SEA

DCA

9h 20m

1 stop

$290Southwest

Sun, Sep 6 - Tue, Sep 15

5:00 pm - 7:51 pm

DCA

SEA

5h 51mnonstop

1:46 pm - 9:59 pm

SEA

DCA

5h 13mnonstop

$292Alaska Airlines

Tue, Sep 1 - Fri, Sep 11

1:59 pm - 12:27 am

DCA

SEA

13h 28m

1 stop

7:41 pm - 12:50 pm

SEA

DCA

14h 09m

1 stop

$292Frontier

Wed, Oct 7 - Sun, Oct 11

5:00 pm - 7:51 pm

DCA

SEA

5h 51mnonstop

1:46 pm - 9:59 pm

SEA

DCA

5h 13mnonstop

$294Alaska Airlines

Wed, Sep 9 - Wed, Sep 16

7:00 am - 1:22 pm

DCA

SEA

9h 22m

1 stop

7:06 pm - 12:51 pm

SEA

DCA

14h 45m

1 stop

$295Frontier

Thu, Aug 27 - Sat, Aug 29

5:39 pm - 10:56 pm

DCA

SEA

8h 17m

1 stop

11:56 pm - 10:00 am

SEA

DCA

7h 04m

1 stop

$305American Airlines

Thu, Aug 27 - Mon, Aug 31

5:00 pm - 12:11 am

DCA

SEA

10h 11m

1 stop

6:18 am - 6:03 pm

SEA

DCA

8h 45m

1 stop

$305American Airlines

Sun, Sep 20 - Sat, Sep 26

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Alaska Airlines flights from Washington, D.C. Reagan-National Airport to Seattle

Our best Alaska Airlines deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets

Alaska Airlines

Sep 1

DCA5:00 pmWashington, D.C. Reagan-National

5h 51m

SEA7:51 pmSeattle/Tacoma Intl

Sep 11

SEA1:46 pmSeattle/Tacoma Intl

5h 13m

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

$292

Alaska Airlines

Aug 25

DCA5:00 pmWashington, D.C. Reagan-National

5h 51m

SEA7:51 pmSeattle/Tacoma Intl

Sep 1

SEA5:40 pmSeattle/Tacoma Intl

19h 20m

1 stop

DCA4:00 pmWashington, D.C. Reagan-National

$295

Alaska Airlines

Sep 5

DCA5:00 pmWashington, D.C. Reagan-National

5h 51m

SEA7:51 pmSeattle/Tacoma Intl

Sep 10

SEA1:46 pmSeattle/Tacoma Intl

5h 13m

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

$298

Delta flights from Washington, D.C. Reagan-National Airport to Seattle

Our best Delta deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets

Delta

Aug 29

DCA4:35 pmWashington, D.C. Reagan-National

6h 06m

SEA7:41 pmSeattle/Tacoma Intl

Sep 11

SEA7:20 amSeattle/Tacoma Intl

5h 12m

DCA3:32 pmWashington, D.C. Reagan-National

$315

Delta

Aug 29

DCA4:35 pmWashington, D.C. Reagan-National

6h 06m

SEA7:41 pmSeattle/Tacoma Intl

Sep 12

SEA7:20 amSeattle/Tacoma Intl

5h 12m

DCA3:32 pmWashington, D.C. Reagan-National

$325

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 9/6

8:00 am-10:54 am

Nonstop5h 54m

Seattle/Tacoma Intl

Tue 9/15

4:27 pm-9:59 pm

1 stop26h 32m

$287

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 9/5

5:00 pm-7:51 pm

Nonstop5h 51m

Seattle/Tacoma Intl

Thu 9/10

4:27 pm-9:59 pm

1 stop26h 32m

$288

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 9/14

4:35 pm-11:55 pm

2 stops10h 20m

Seattle/Tacoma Intl

Fri 9/18

5:15 am-2:50 pm

1 stop6h 35m

$290

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 9/6

6:05 am-1:00 pm

2 stops9h 55m

Seattle/Tacoma Intl

Tue 9/15

11:05 pm-11:25 am

1 stop9h 20m

$290

Quickest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 9/1

5:00 pm-7:51 pm

Nonstop5h 51m

Seattle/Tacoma Intl

Fri 9/11

1:46 pm-9:59 pm

Nonstop5h 13m

$292

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 10/7

1:59 pm-12:27 am

1 stop13h 28m

Seattle/Tacoma Intl

Sun 10/11

7:41 pm-12:50 pm

1 stop14h 09m

$292

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 9/9

5:00 pm-7:51 pm

Nonstop5h 51m

Seattle/Tacoma Intl

Wed 9/16

1:46 pm-9:59 pm

Nonstop5h 13m

$294

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 8/27

7:00 am-1:22 pm

1 stop9h 22m

Seattle/Tacoma Intl

Sat 8/29

7:06 pm-12:51 pm

1 stop14h 45m

$295

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 8/27

5:39 pm-10:56 pm

1 stop8h 17m

Seattle/Tacoma Intl

Mon 8/31

11:56 pm-10:00 am

1 stop7h 04m

$305

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 9/20

5:00 pm-12:11 am

1 stop10h 11m

Seattle/Tacoma Intl

Sat 9/26

6:18 am-6:03 pm

1 stop8h 45m

$305

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. Reagan-National Airport 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

Other information

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

Prices are currently low for flights on this route.

Typical prices usually range from $320 to $562.
The lowest price recently found on this route was $287.

What is the cheapest month to fly to Seattle?

In general, February is the cheapest month to fly from Washington, D.C. Reagan-National Airport to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $293. If you don’t want to visit Seattle in February, then you should wait until January to fly from Washington, D.C. Reagan-National Airport, when ticket prices are also cheap, with an average price of $313.

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. Reagan-National Airport is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $459. 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. Reagan-National Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $594.

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

Flying to Seattle from Washington, D.C. Reagan-National Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $486 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the evening, with an average ticket price of $643. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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

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

How far in advance should I book a flight from Washington, D.C. Reagan-National Airport to Seattle?

You are more likely to see cheaper flights to Seattle from Washington, D.C. Reagan-National Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $444 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. Reagan-National Airport for as low as $377 on momondo.

What cabin class options are available on Washington, D.C. Reagan-National Airport to Seattle flights?

There are 4 cabin classes available to choose from on Washington, D.C. Reagan-National Airport to Seattle 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. Reagan-National Airport to Seattle flights?

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

How have Washington, D.C. Reagan-National Airport to Seattle flight prices changed over time?

As of July 2026, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 20% more expensive when compared to flights at the same time last year.

When to book flights from Washington, D.C. Reagan-National Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to Seattle (DCA to SEA) flight deals and tips

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

Best Price Found	$233
Fastest flight time	5h 50m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Washington, D.C. Reagan-National Airport in the past 72 hours is $233. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to Seattle found on momondo in the last 72 hours is $386.

The fastest flight from Washington, D.C. Reagan-National Airport to Seattle takes 5h 50m

Direct flights go from Washington, D.C. Reagan-National Airport to Seattle every day.

There is 1 airport in Seattle. From Washington, D.C. Reagan-National Airport there are direct flights to Seattle/Tacoma Intl (SEA).

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Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Seattle

How far is Washington, D.C. Reagan-National to Seattle/Tacoma Intl by plane?
There are 2322.2 mi between Washington, D.C. Reagan-National and Seattle/Tacoma Intl. Typically, this will take 5h 50m by plane in normal conditions.
When did momondo last update prices for flights from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport?
As of July 2026, there are 7 operators available to choose from for flights from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Washington, D.C. Reagan-National Airport to Seattle?
momondo data reveals that the most frequently booked plane model on the route from Washington, D.C. Reagan-National Airport to Seattle is Boeing 737-800 Passenger/BBJ2 (winglets), representing 27.16% of all bookings. The subsequent popular models are Airbus A321neo at 20.03%, Boeing 737 at 17.44%, and Boeing 737 MAX 9 at 15.06%.
What is the most popular airline from Washington, D.C. Reagan-National Airport to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. Reagan-National Airport to Seattle is Alaska Airlines (54% of total bookings). The next most popular airlines are Delta (22%), United Airlines (8%), and Frontier (7%).

Best airlines flying from Washington, D.C. Reagan-National Airport to Seattle

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $123	Free Cancellation	Rating 5.6 2,755 reviews	Search Frontier flights
Delta	PriceFrom $173	Free Cancellation	Rating 7.8 8,489 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $178	Free Cancellation	Rating 7.8 2,821 reviews	Search Hawaiian Airlines flights
Southwest	PriceFrom $218	Free Cancellation	Rating 8.0 4,228 reviews	Search Southwest flights
American Airlines	PriceFrom $218	Free Cancellation	Rating 7.1 11,845 reviews	Search American Airlines flights
United Airlines	PriceFrom $237	Free Cancellation	Rating 7.4 10,042 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $264	Free Cancellation	Rating 7.9 12,721 reviews	Search Alaska Airlines flights

Alaska Airlines Flights From Washington, D.C. Reagan-National Airport to Seattle
Across 9 Alaska Airlines flights from Washington, D.C. Reagan-National Airport to Seattle this week, the average price was $538, with the best Alaska Airlines deals starting from $264 round-trip. 12,721 users have rated Alaska Airlines on momondo, with an average score of 7.9/10.
Delta Flights From Washington, D.C. Reagan-National Airport to Seattle
The best Delta deal for Washington, D.C. Reagan-National Airport to Seattle flight tickets found on momondo in the last 72 hours was $173, round-trip. It should be noted that an average Delta flight deal for this route in this time was higher, at $388 round-trip. Delta operates 7 flights out of Washington, D.C. Reagan-National Airport into Seattle in an average week, so prices vary by time and availability. 8,489 Delta reviews by users on momondo have scored the airline at 7.8/10.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Redmond

Kent

Lakewood

Tukwila

Puyallup

Fife

Federal Way

Cle Elum

Marysville

Kirkland

Centralia

Shoreline

Lacey

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington, D.C. to Seattle. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Seattle from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Washington, D.C. to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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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Airports servicing Washington

Walla Walla Airport

Bellingham Airport

Wenatchee Pangborn Field Airport

Eastsound Orcas Island Airport

Friday Harbor SPB Airport

Spokane Airport

Kenmore Air Harbor Airport

Pasco Tri Cities Airport

Pullman Moscow Regional Airport

Rosario SPB Airport

Yakima Air Terminal Airport

Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $168

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Alaska Airlines flights from Washington, D.C. Reagan-National Airport to Seattle

Our best Alaska Airlines deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets

Delta flights from Washington, D.C. Reagan-National Airport to Seattle

Our best Delta deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets

momondo Fare Finder

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

See travel insights to Seattle from

How to get the cheapest flight ticket from Washington, D.C. Reagan-National Airport to Seattle

What is the typical price of a round-trip flight between Washington, D.C. Reagan-National Airport 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. Reagan-National to Seattle/Tacoma Intl flight route?

How far in advance should I book a flight from Washington, D.C. Reagan-National Airport to Seattle?

What cabin class options are available on Washington, D.C. Reagan-National Airport to Seattle flights?

Can stopping save me money on Washington, D.C. Reagan-National Airport to Seattle flights?

How have Washington, D.C. Reagan-National Airport to Seattle flight prices changed over time?

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

What airlines fly to Seattle?

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

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

When to book flights from Washington, D.C. Reagan-National Airport to Seattle

Cheap Washington, D.C. Reagan-National Airport to Seattle (DCA to SEA) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Airports in Seattle

Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Seattle

Best airlines flying from Washington, D.C. Reagan-National Airport to Seattle

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

Traveling to a place near Seattle?

Why use momondo?

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.

Find better results for your trip to the United States

Airports servicing Washington

Fly your favorite airline to Seattle

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List of cabin classes available on flights landing in Seattle. Availability may vary depending on flight origin and airline.

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