Cheap Flights from Washington (IAD) to Seattle (SEA) from HK$1,895~

View HK$1,895 flight on Wed, 17 Jun 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Seattle

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

Prices were available within the past 7 days and start at HK$1,895 for one-way flights and HK$5,230 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,230 Return, found 6 days ago
HK$5,230
Return
found 6 days ago
Select United flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,230 found 6 days ago
United
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,294 Return, found 6 days ago
HK$5,294
Return
found 6 days ago
Select United flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,294 found 6 days ago
American Airlines
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,390 Return, found 6 days ago
HK$5,390
Return
found 6 days ago
Select American Airlines flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,390 found 6 days ago
Delta
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,434 Return, found 6 days ago
HK$5,434
Return
found 6 days ago
Select Delta flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,434 found 6 days ago
American Airlines
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,477 Return, found 6 days ago
HK$5,477
Return
found 6 days ago
Select American Airlines flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,477 found 6 days ago
United
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,584 Return, found 6 days ago
HK$5,584
Return
found 6 days ago
Select United flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,584 found 6 days ago
United
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,595 Return, found 6 days ago
HK$5,595
Return
found 6 days ago
Select United flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,595 found 6 days ago
United
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,628 Return, found 6 days ago
HK$5,628
Return
found 6 days ago
Select United flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,628 found 6 days ago
Delta
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,659 Return, found 6 days ago
HK$5,659
Return
found 6 days ago
Select Delta flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,659 found 6 days ago
United
Wed, 17 Jun - Sun, 21 Jun
IAD
Washington
SEA
Seattle
HK$5,660 Return, found 6 days ago
HK$5,660
Return
found 6 days ago
Select United flight, departing Wed, 17 Jun from Washington to Seattle, returning Sun, 21 Jun, priced at HK$5,660 found 6 days ago

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

February is typically the cheapest month to fly

From HK$1,238 - HK$2,267 per traveller.

Frequently asked questions

How much is a flight from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)?
Start packing your bags, because round-trip flights from IAD to Sea-Tac Airport start from HK$5,230. That's based on fares advertised within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book today to get the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from IAD to Sea-Tac Airport?
Most flights can be conveniently canceled online, but whether you incur a fee differs between airlines. If you do need to cancel your vacation, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Dulles Intl. Airport to Seattle - Tacoma Intl. Airport (SEA) 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 Dulles Intl. Airport to Seattle - Tacoma Intl. Airport (SEA) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Dulles Intl. Airport to Seattle - Tacoma Intl. Airport (SEA)?
You'll be in the air for a while, as the flight distance between Chantilly and SeaTac is 3,700 kilometers. Set up a playlist of your favorite songs before leaving home to keep yourself entertained during your trip.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to SEA?
United Airlines (UA) is a popular option. It offers 60 flights from IAD to Sea-Tac Airport each month. Offering 56 flights a month along this route, Alaska Airlines (AS) is another top pick.
Are IAD to Sea-Tac Airport flight tickets cheaper when they're purchased at the last minute?
It is possible to find a fantastic last-minute deal from IAD to Seattle - Tacoma Intl. Airport (SEA), but it can also be hit-or-miss. As many airlines release seats up to 12 months in advance, it's worthwhile keeping an eye on fares early and being ready to pounce when you see a good bargain. Expedia compares air carrier prices and updates flight deals frequently, so you can rest assured you're always seeing the latest offers.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
HK$5,230
Distance
3679 km
Average flight time
2 hours 55 mins

Book with confidence

Flights from Chantilly to Seattle

Book cheap flights from Chantilly (IAD) 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 Chantilly (IAD) 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 Chantilly (IAD) 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$1,895 now!

 

Flights from Chantilly to Seattle

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