S$151 Cheap Flights from Seattle to Washington

View S$151 flight on Mon, 15 Dec, 2025Opens in a new window

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

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Cheap Flights from Seattle to Washington (SEA-IAD)

Prices were available within the past 7 days and start at S$151 for one-way flights and S$376 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, 1 Jan - Thu, 8 Jan
SEA
Seattle
IAD
Washington
S$376 Return, found 6 days ago
S$376
Return
found 6 days ago
Select Delta flight, departing Thu, 1 Jan from Seattle to Washington, returning Thu, 8 Jan, priced at S$376 found 6 days ago
Delta
Thu, 1 Jan - Thu, 8 Jan
SEA
Seattle
IAD
Washington
S$388 Return, found 6 days ago
S$388
Return
found 6 days ago
Select Delta flight, departing Thu, 1 Jan from Seattle to Washington, returning Thu, 8 Jan, priced at S$388 found 6 days ago
American Airlines
Thu, 1 Jan - Thu, 8 Jan
SEA
Seattle
IAD
Washington
S$422 Return, found 6 days ago
S$422
Return
found 6 days ago
Select American Airlines flight, departing Thu, 1 Jan from Seattle to Washington, returning Thu, 8 Jan, priced at S$422 found 6 days ago
Delta
Thu, 1 Jan - Thu, 8 Jan
SEA
Seattle
IAD
Washington
S$467 Return, found 6 days ago
S$467
Return
found 6 days ago
Select Delta flight, departing Thu, 1 Jan from Seattle to Washington, returning Thu, 8 Jan, priced at S$467 found 6 days ago
Delta
Fri, 27 Mar - Mon, 30 Mar
SEA
Seattle
IAD
Washington
S$551 Return, found 3 days ago
S$551
Return
found 3 days ago
Select Delta flight, departing Fri, 27 Mar from Seattle to Washington, returning Mon, 30 Mar, priced at S$551 found 3 days ago
United
Fri, 27 Mar - Mon, 30 Mar
SEA
Seattle
IAD
Washington
S$557 Return, found 3 days ago
S$557
Return
found 3 days ago
Select United flight, departing Fri, 27 Mar from Seattle to Washington, returning Mon, 30 Mar, priced at S$557 found 3 days ago
United
Fri, 27 Mar - Mon, 30 Mar
SEA
Seattle
IAD
Washington
S$570 Return, found 3 days ago
S$570
Return
found 3 days ago
Select United flight, departing Fri, 27 Mar from Seattle to Washington, returning Mon, 30 Mar, priced at S$570 found 3 days ago
United
Fri, 27 Mar - Mon, 30 Mar
SEA
Seattle
IAD
Washington
S$583 Return, found 3 days ago
S$583
Return
found 3 days ago
Select United flight, departing Fri, 27 Mar from Seattle to Washington, returning Mon, 30 Mar, priced at S$583 found 3 days ago
United
Fri, 27 Mar - Mon, 30 Mar
SEA
Seattle
IAD
Washington
S$609 Return, found 3 days ago
S$609
Return
found 3 days ago
Select United flight, departing Fri, 27 Mar from Seattle to Washington, returning Mon, 30 Mar, priced at S$609 found 3 days ago
American Airlines
Fri, 27 Mar - Mon, 30 Mar
SEA
Seattle
IAD
Washington
S$609 Return, found 3 days ago
S$609
Return
found 3 days ago
Select American Airlines flight, departing Fri, 27 Mar from Seattle to Washington, returning Mon, 30 Mar, priced at S$609 found 3 days ago

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

January is typically the cheapest month to fly

From S$221 - S$396 per traveller.
Seattle to Washington route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Washington Dulles Intl.
Return price
S$330
Distance
3679 km
Average flight time
7 hours 58 mins

Perfect flights from Seattle to Washington

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*Note: Prices may vary based on availability and are subject to change.

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