Cheap Flights from Washington (DCA) to Seattle (SEA) from HK$1,250~

View HK$1,250 flight on Tue, 16 Dec 2025Opens in a new window

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

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Find Cheap Flights from Washington (DCA) to Seattle (SEA)

Prices were available within the past 7 days and start at HK$1,250 for one-way flights and HK$2,575 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 16 Dec - Sat, 17 Jan
DCA
Washington
SEA
Seattle
HK$2,575 Return, found 1 day ago
HK$2,575
Return
found 1 day ago
Select Delta flight, departing Tue, 16 Dec from Washington to Seattle, returning Sat, 17 Jan, priced at HK$2,575 found 1 day ago
Delta
Mon, 15 Dec - Thu, 15 Jan
DCA
Washington
SEA
Seattle
HK$2,650 Return, found 10 hours ago
HK$2,650
Return
found 10 hours ago
Select Delta flight, departing Mon, 15 Dec from Washington to Seattle, returning Thu, 15 Jan, priced at HK$2,650 found 10 hours ago
Delta
Tue, 16 Dec - Sat, 17 Jan
DCA
Washington
SEA
Seattle
HK$3,125 Return, found 1 day ago
HK$3,125
Return
found 1 day ago
Select Delta flight, departing Tue, 16 Dec from Washington to Seattle, returning Sat, 17 Jan, priced at HK$3,125 found 1 day ago
United
Tue, 16 Dec - Sat, 17 Jan
DCA
Washington
SEA
Seattle
HK$3,136 Return, found 1 day ago
HK$3,136
Return
found 1 day ago
Select United flight, departing Tue, 16 Dec from Washington to Seattle, returning Sat, 17 Jan, priced at HK$3,136 found 1 day ago
American Airlines
Tue, 16 Dec - Sat, 17 Jan
DCA
Washington
SEA
Seattle
HK$3,202 Return, found 1 day ago
HK$3,202
Return
found 1 day ago
Select American Airlines flight, departing Tue, 16 Dec from Washington to Seattle, returning Sat, 17 Jan, priced at HK$3,202 found 1 day ago
Delta
Tue, 16 Dec - Sat, 17 Jan
DCA
Washington
SEA
Seattle
HK$3,276 Return, found 1 day ago
HK$3,276
Return
found 1 day ago
Select Delta flight, departing Tue, 16 Dec from Washington to Seattle, returning Sat, 17 Jan, priced at HK$3,276 found 1 day ago
American Airlines
Mon, 15 Dec - Thu, 15 Jan
DCA
Washington
SEA
Seattle
HK$3,277 Return, found 10 hours ago
HK$3,277
Return
found 10 hours ago
Select American Airlines flight, departing Mon, 15 Dec from Washington to Seattle, returning Thu, 15 Jan, priced at HK$3,277 found 10 hours ago
Delta
Mon, 15 Dec - Thu, 15 Jan
DCA
Washington
SEA
Seattle
HK$3,286 Return, found 10 hours ago
HK$3,286
Return
found 10 hours ago
Select Delta flight, departing Mon, 15 Dec from Washington to Seattle, returning Thu, 15 Jan, priced at HK$3,286 found 10 hours ago
United
Sat, 13 Dec - Sat, 17 Jan
DCA
Washington
SEA
Seattle
HK$3,353 Return, found 1 day ago
HK$3,353
Return
found 1 day ago
Select United flight, departing Sat, 13 Dec from Washington to Seattle, returning Sat, 17 Jan, priced at HK$3,353 found 1 day ago
Delta
Mon, 15 Dec - Thu, 15 Jan
DCA
Washington
SEA
Seattle
HK$3,362 Return, found 10 hours ago
HK$3,362
Return
found 10 hours ago
Select Delta flight, departing Mon, 15 Dec from Washington to Seattle, returning Thu, 15 Jan, priced at HK$3,362 found 10 hours ago

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

September is typically the cheapest month to fly

From HK$1,083 - HK$2,397 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
HK$2,575
Distance
3715 km
Average flight time
2 hours 56 mins

Flights from Washington to Seattle

Book cheap flights from Washington (DCA) to Seattle (SEA) on Expedia.com.hk. Find the best flight deals to destinations around the world for your next leisure or business travel on Expedia.com.hk.

Search for flights from Washington (DCA) to Seattle (SEA) to find great flight deals suitable to your travel date and time. Expedia.com.hk flight booking search engine is simple to use and looking for cheap flights is as easy as a click of a mouse or on your mobile devices.

Be 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 (DCA) to Seattle (SEA) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

Save more when combine your Seattle flight with a hotel for a package deal! Discover additional savings by booking in advance. Now you can find activities in Seattle and things to do in Seattle for your perfect vacation with Expedia Thing to Do.

If you would like to book flights to Seattle more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to Seattle is HK$1,250 now!

 

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 HK$2,575. 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 canceled 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 kilometers 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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