S$166 Cheap Flights from Washington to Seattle

View S$166 flight on Tue, 12 Aug, 2025Opens in a new window

Popular airlines from Ronald Reagan Washington National Airport (DCA) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Washington to Seattle (DCA-SEA)

Prices were available within the past 7 days and start at S$166 for one-way flights and S$330 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 20 Aug - Wed, 27 Aug
DCA
Washington
SEA
Seattle
S$330 Return, found 1 day ago
S$330
Return
found 1 day ago
Select Delta flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$330 found 1 day ago
Delta
Wed, 20 Aug - Wed, 27 Aug
DCA
Washington
SEA
Seattle
S$433 Return, found 1 day ago
S$433
Return
found 1 day ago
Select Delta flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$433 found 1 day ago
United
Wed, 20 Aug - Wed, 27 Aug
DCA
Washington
SEA
Seattle
S$440 Return, found 1 day ago
S$440
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$440 found 1 day ago
Delta
Wed, 20 Aug - Wed, 27 Aug
DCA
Washington
SEA
Seattle
S$446 Return, found 1 day ago
S$446
Return
found 1 day ago
Select Delta flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$446 found 1 day ago
Delta
Wed, 6 Aug - Wed, 13 Aug
DCA
Washington
SEA
Seattle
S$448 Return, found 5 days ago
S$448
Return
found 5 days ago
Select Delta flight, departing Wed, 6 Aug from Washington to Seattle, returning Wed, 13 Aug, priced at S$448 found 5 days ago
Delta
Wed, 6 Aug - Wed, 13 Aug
DCA
Washington
SEA
Seattle
S$450 Return, found 5 days ago
S$450
Return
found 5 days ago
Select Delta flight, departing Wed, 6 Aug from Washington to Seattle, returning Wed, 13 Aug, priced at S$450 found 5 days ago
Delta
Wed, 6 Aug - Wed, 13 Aug
DCA
Washington
SEA
Seattle
S$455 Return, found 5 days ago
S$455
Return
found 5 days ago
Select Delta flight, departing Wed, 6 Aug from Washington to Seattle, returning Wed, 13 Aug, priced at S$455 found 5 days ago
American Airlines
Wed, 20 Aug - Wed, 27 Aug
DCA
Washington
SEA
Seattle
S$472 Return, found 1 day ago
S$472
Return
found 1 day ago
Select American Airlines flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$472 found 1 day ago
Delta
Wed, 6 Aug - Wed, 13 Aug
DCA
Washington
SEA
Seattle
S$474 Return, found 5 days ago
S$474
Return
found 5 days ago
Select Delta flight, departing Wed, 6 Aug from Washington to Seattle, returning Wed, 13 Aug, priced at S$474 found 5 days ago
United
Wed, 20 Aug - Wed, 27 Aug
DCA
Washington
SEA
Seattle
S$477 Return, found 1 day ago
S$477
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$477 found 1 day ago

Find the cheapest month to fly from Washington (DCA) to Seattle (SEA)

September is typically the cheapest month to fly

From S$177 - S$405 per traveller.

Graph displaying average flight prices per month

Washington to Seattle route information
Origin airport
Ronald Reagan Washington National
Destination airport
Seattle - Tacoma Intl.
Airlines serving
American Airlines, Delta, United
Return price
S$330
Distance
3715 km
Average flight time
2 hours 57 mins

Flights from Washington to Seattle

There are several airlines that operate frequent flights from Washington D.C. (DCA) to Seattle (SEA) including

The earliest flight leaves Ronald Reagan Washington National Airport at 08:00 and arrives at Seattle Tacoma Intl. Airport at 10:50. The last flight of the day departs Washington D.C. at 18:55 and arrives at Seattle at 22:05.

The flight distance from Washington D.C. to Seattle is about 3757 km, the shortest flight is 05 hours 50 minutes with .

Expedia lets you search across the largest number of airlines and Seattle flights, which means that you’ll be able to find a great flight deal at the perfect travel date and time. Our simple-to-use booking engine makes looking for terrific bargains easy and hassle-free; just enter your travel dates and departure city, and let Expedia do the rest! Adjust your travel dates and explore connecting flights to find an even better deal on your Washington Seattle flight!

Browse through dozens of options and rest assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your Washington to Seattle trip. There’s simply no substitute for great prices suited to your travel needs and backed by excellent customer support.

Combine your Seattle flight with a hotel and/or car rental for a package deal designed to save you even more money! Discover additional savings by booking in advance or find a last minute deal. There are tons of ways to save on your flights from Washington to Seattle with Expedia. Use us as your stop travel destination and have the confidence that you’re getting a bargain!

Frequently asked questions

How much is a flight from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA)?
Round-trip flights from National Airport to Sea-Tac Airport start from S$330. This price is based on fares advertised within the last 7 days on Expedia for flights departing within the next year --- book today to avoid missing out. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from National Airport to Sea-Tac Airport?
The majority of flights can be conveniently cancelled online, but whether or not you incur a fee varies between airlines. If you do have to cancel your getaway, follow the easy instructions in the Customer Service Portal.
How do I find cheap flights from Ronald Reagan Washington National Airport (DCA) to Sea-Tac Airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Ronald Reagan Washington National Airport (DCA) to Sea-Tac Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from DCA to Sea-Tac Airport?
It's around 3,700 kilometres from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA), so you'll be strapped into your seat for a while. Keep yourself entertained with things like your e-reader or the latest bestseller.
Which airlines fly direct from National Airport to Seattle - Tacoma Intl. Airport (SEA)?
Check out the fares with Alaska Airlines (AS) if you want to fly straight from Ronald Reagan Washington National Airport (DCA) to Sea-Tac Airport. This popular carrier operates 60 flights monthly, so you're sure to find one that suits your schedule.
Are Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute?
Late planners can sometimes score a bargain, with some of the cheapest airfares from Ronald Reagan Washington National Airport (DCA) to Seattle - Tacoma Intl. Airport (SEA) showing up a few weeks before the date of departure. If you'd rather book ahead, Expedia compares and updates the best flight deals continually --- as early as a year in advance in some cases. It depends on the carrier though, as not all airlines advertise prices that far in advance.

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