Cheap Flights from Seattle (SEA) to Washington (IAD) from HK$776~

View HK$776 flight on Sat, 24 Jan 2026Opens in a new window

Popular airlines from Seattle to Washington, DC (IAD-Washington Dulles Intl.)

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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$776 for one-way flights and HK$1,240 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$1,240 Return, found 1 day ago
HK$1,240
Return
found 1 day ago
Select Delta flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$1,240 found 1 day ago
Delta
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$1,316 Return, found 1 day ago
HK$1,316
Return
found 1 day ago
Select Delta flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$1,316 found 1 day ago
Delta
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$1,392 Return, found 1 day ago
HK$1,392
Return
found 1 day ago
Select Delta flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$1,392 found 1 day ago
Delta
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$1,950 Return, found 1 day ago
HK$1,950
Return
found 1 day ago
Select Delta flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$1,950 found 1 day ago
United
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$2,025 Return, found 1 day ago
HK$2,025
Return
found 1 day ago
Select United flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$2,025 found 1 day ago
United
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$2,026 Return, found 1 day ago
HK$2,026
Return
found 1 day ago
Select United flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$2,026 found 1 day ago
American Airlines
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$2,102 Return, found 1 day ago
HK$2,102
Return
found 1 day ago
Select American Airlines flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$2,102 found 1 day ago
Delta
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$2,176 Return, found 1 day ago
HK$2,176
Return
found 1 day ago
Select Delta flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$2,176 found 1 day ago
United
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$2,217 Return, found 1 day ago
HK$2,217
Return
found 1 day ago
Select United flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$2,217 found 1 day ago
Delta
Sat, 24 Jan - Sat, 31 Jan
SEA
Seattle
IAD
Washington
HK$2,251 Return, found 1 day ago
HK$2,251
Return
found 1 day ago
Select Delta flight, departing Sat, 24 Jan from Seattle to Washington, returning Sat, 31 Jan, priced at HK$2,251 found 1 day ago

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

February is typically the cheapest month to fly

From HK$1,238 - HK$2,306 per traveller.

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$1,240. 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.

Travel information

0
Origin airport
Seattle - Tacoma Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, United
Return price
HK$1,240
Distance
3679 km

Book with confidence

Flights from Seattle to Chantilly

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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).

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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$776 now!

 

Flights from Seattle to Chantilly

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