RM486 Cheap Flights from Washington (IAD) to Seattle (SEA)

View RM486 flight on Sat, 24 Jan 2026Opens in a new window

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

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Cheap Flights from Washington to Seattle (IAD-SEA)

Prices were available within the past 7 days and start at RM486 for one-way flights and RM1,518 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,518 Return, found 7 hours ago
RM1,518
Return
found 7 hours ago
Select Delta flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,518 found 7 hours ago
United
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,536 Return, found 7 hours ago
RM1,536
Return
found 7 hours ago
Select United flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,536 found 7 hours ago
Delta
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,600 Return, found 7 hours ago
RM1,600
Return
found 7 hours ago
Select Delta flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,600 found 7 hours ago
Delta
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,884 Return, found 7 hours ago
RM1,884
Return
found 7 hours ago
Select Delta flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,884 found 7 hours ago
United
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,885 Return, found 7 hours ago
RM1,885
Return
found 7 hours ago
Select United flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,885 found 7 hours ago
United
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,907 Return, found 7 hours ago
RM1,907
Return
found 7 hours ago
Select United flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,907 found 7 hours ago
United
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,925 Return, found 7 hours ago
RM1,925
Return
found 7 hours ago
Select United flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,925 found 7 hours ago
United
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,947 Return, found 7 hours ago
RM1,947
Return
found 7 hours ago
Select United flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,947 found 7 hours ago
American Airlines
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,966 Return, found 7 hours ago
RM1,966
Return
found 7 hours ago
Select American Airlines flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,966 found 7 hours ago
United
Thu, 22 Jan - Wed, 28 Jan
IAD
Washington
SEA
Seattle
RM1,988 Return, found 7 hours ago
RM1,988
Return
found 7 hours ago
Select United flight, departing Thu, 22 Jan from Washington to Seattle, returning Wed, 28 Jan, priced at RM1,988 found 7 hours ago

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

February is typically the cheapest month to fly

From RM 657 - RM 1,203 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 RM1,518. 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 cancelled online, but whether you incur a fee differs between airlines. If you do need to cancel your holiday, 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 kilometres. Set up a playlist of your favourite 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
RM1,518
Distance
3679 km
Average flight time
3 hours 14 mins

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Perfect flights from Washington to Seattle

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*Note: Prices may vary based on availability and are subject to change.
Perfect flights from Washington to Seattle

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