Cheap Flights from Seattle (SEA) to Washington (IAD) from HK$937~

View HK$937 flight on Thu, 11 Dec 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Washington Dulles Intl. Airport (IAD)

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

Prices were available within the past 7 days and start at HK$937 for one-way flights and HK$3,057 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 18 Nov - Thu, 27 Nov
SEA
Seattle
IAD
Washington
HK$3,057 Return, found 3 days ago
HK$3,057
Return
found 3 days ago
Select Delta flight, departing Tue, 18 Nov from Seattle to Washington, returning Thu, 27 Nov, priced at HK$3,057 found 3 days ago
Delta
Fri, 21 Nov - Thu, 27 Nov
SEA
Seattle
IAD
Washington
HK$3,133 Return, found 3 days ago
HK$3,133
Return
found 3 days ago
Select Delta flight, departing Fri, 21 Nov from Seattle to Washington, returning Thu, 27 Nov, priced at HK$3,133 found 3 days ago
Delta
Tue, 18 Nov - Tue, 25 Nov
SEA
Seattle
IAD
Washington
HK$3,207 Return, found 3 days ago
HK$3,207
Return
found 3 days ago
Select Delta flight, departing Tue, 18 Nov from Seattle to Washington, returning Tue, 25 Nov, priced at HK$3,207 found 3 days ago
Delta
Fri, 21 Nov - Tue, 25 Nov
SEA
Seattle
IAD
Washington
HK$3,283 Return, found 3 days ago
HK$3,283
Return
found 3 days ago
Select Delta flight, departing Fri, 21 Nov from Seattle to Washington, returning Tue, 25 Nov, priced at HK$3,283 found 3 days ago
Alaska Airlines
Tue, 18 Nov - Wed, 26 Nov
SEA
Seattle
IAD
Washington
HK$3,519 Return, found 3 days ago
HK$3,519
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 18 Nov from Seattle to Washington, returning Wed, 26 Nov, priced at HK$3,519 found 3 days ago
Delta
Sun, 23 Nov - Tue, 25 Nov
SEA
Seattle
IAD
Washington
HK$3,756 Return, found 3 days ago
HK$3,756
Return
found 3 days ago
Select Delta flight, departing Sun, 23 Nov from Seattle to Washington, returning Tue, 25 Nov, priced at HK$3,756 found 3 days ago
Alaska Airlines
Fri, 21 Nov - Wed, 26 Nov
SEA
Seattle
IAD
Washington
HK$4,175 Return, found 3 days ago
HK$4,175
Return
found 3 days ago
Select Alaska Airlines flight, departing Fri, 21 Nov from Seattle to Washington, returning Wed, 26 Nov, priced at HK$4,175 found 3 days ago
Delta
Tue, 18 Nov - Sat, 22 Nov
SEA
Seattle
IAD
Washington
HK$4,261 Return, found 3 days ago
HK$4,261
Return
found 3 days ago
Select Delta flight, departing Tue, 18 Nov from Seattle to Washington, returning Sat, 22 Nov, priced at HK$4,261 found 3 days ago
United
Fri, 21 Nov - Mon, 24 Nov
SEA
Seattle
IAD
Washington
HK$4,498 Return, found 3 days ago
HK$4,498
Return
found 3 days ago
Select United flight, departing Fri, 21 Nov from Seattle to Washington, returning Mon, 24 Nov, priced at HK$4,498 found 3 days ago
American Airlines
Fri, 21 Nov - Mon, 24 Nov
SEA
Seattle
IAD
Washington
HK$4,574 Return, found 3 days ago
HK$4,574
Return
found 3 days ago
Select American Airlines flight, departing Fri, 21 Nov from Seattle to Washington, returning Mon, 24 Nov, priced at HK$4,574 found 3 days ago

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

January is typically the cheapest month to fly

From HK$1,311 - HK$2,352 per traveller.

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Washington Dulles Intl. IAD. Cheapest option available. Average driving time to city centre is 36 minutes. Flights from HK$3,133
IAD
Washington Dulles Intl.
Cheapest
Average driving time to city centre36 min
Flights from HK$3,133
Seattle to Washington route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Washington Dulles Intl.
Return price
HK$3,057
Distance
3679 km
Average flight time
7 hours 57 mins

Flights from Seattle to Chantilly

Book cheap flights from Seattle (SEA) to Chantilly (IAD) 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 Seattle (SEA) to Chantilly (IAD) 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 Seattle (SEA) to Chantilly (IAD) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

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

If you would like to book flights to Chantilly more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to Chantilly is HK$937 now!

 

Frequently asked questions

How much is a flight from Sea-Tac Airport to Washington Dulles Intl. Airport (IAD)?
The lowest price advertised for a round-trip journey between SEA and Washington Dulles Intl. Airport (IAD) is HK$3,057. But you better act quick. This price is based on fares quoted within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Sea-Tac Airport to Washington Dulles Intl. Airport (IAD)?
Most flights can be canceled online, but whether or not you incur a fee varies between airlines. If you do need to cancel your getaway, follow the instructions in the Customer Service Portal.
How do I find cheap flights from SEA to IAD 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 SEA to IAD flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Sea-Tac Airport to Dulles Intl. Airport?
The flight distance between Sea-Tac Airport (SEA) and Washington Dulles Intl. Airport (IAD) (IAD) is 3,700 kilometers. Sneak in a nap or make a start on the latest bestseller and the trip will zip on by.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to Dulles Intl. Airport?
There are a few airlines that fly directly from Seattle - Tacoma Intl. Airport (SEA) to IAD. United Airlines (UA) is a great choice, offering 60 flights every month. Offering 56 flights every month along this route, Alaska Airlines (AS) is another good option.
Are SEA to Washington Dulles Intl. Airport (IAD) flight tickets cheaper when they're purchased at the last minute?
Booking last minute from Seattle - Tacoma Intl. Airport (SEA) to IAD can be hit-or-miss. You might be lucky and score a bargain, but you could also miss out completely! If you'd rather play it safe and start your travel planning early on, Expedia compares flight deals up to a year in advance. Just remember that not all airlines advertise their prices that far in advance. Our top tip? Check back often as prices are updated regularly.

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