S$155 Cheap Flights from Seattle to Washington

View S$155 flight on Sun, 15 Feb, 2026Opens in a new window

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

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Cheap Flights from Seattle to Washington (SEA-IAD)

Prices were available within the past 7 days and start at S$155 for one-way flights and S$257 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, 19 Feb - Thu, 26 Feb
SEA
Seattle
IAD
Washington
S$257 Return, found 6 days ago
S$257
Return
found 6 days ago
Select Delta flight, departing Thu, 19 Feb from Seattle to Washington, returning Thu, 26 Feb, priced at S$257 found 6 days ago
Delta
Thu, 19 Feb - Thu, 26 Feb
SEA
Seattle
IAD
Washington
S$283 Return, found 6 days ago
S$283
Return
found 6 days ago
Select Delta flight, departing Thu, 19 Feb from Seattle to Washington, returning Thu, 26 Feb, priced at S$283 found 6 days ago
Delta
Sat, 28 Feb - Thu, 30 Apr
SEA
Seattle
IAD
Washington
S$346 Return, found 3 days ago
S$346
Return
found 3 days ago
Select Delta flight, departing Sat, 28 Feb from Seattle to Washington, returning Thu, 30 Apr, priced at S$346 found 3 days ago
Delta
Sat, 28 Feb - Thu, 30 Apr
SEA
Seattle
IAD
Washington
S$371 Return, found 3 days ago
S$371
Return
found 3 days ago
Select Delta flight, departing Sat, 28 Feb from Seattle to Washington, returning Thu, 30 Apr, priced at S$371 found 3 days ago
United
Thu, 19 Feb - Thu, 26 Feb
SEA
Seattle
IAD
Washington
S$380 Return, found 6 days ago
S$380
Return
found 6 days ago
Select United flight, departing Thu, 19 Feb from Seattle to Washington, returning Thu, 26 Feb, priced at S$380 found 6 days ago
Delta
Mon, 16 Feb - Mon, 23 Feb
SEA
Seattle
IAD
Washington
S$384 Return, found 6 days ago
S$384
Return
found 6 days ago
Select Delta flight, departing Mon, 16 Feb from Seattle to Washington, returning Mon, 23 Feb, priced at S$384 found 6 days ago
Delta
Thu, 19 Feb - Thu, 26 Feb
SEA
Seattle
IAD
Washington
S$385 Return, found 6 days ago
S$385
Return
found 6 days ago
Select Delta flight, departing Thu, 19 Feb from Seattle to Washington, returning Thu, 26 Feb, priced at S$385 found 6 days ago
Delta
Thu, 19 Feb - Thu, 26 Feb
SEA
Seattle
IAD
Washington
S$386 Return, found 6 days ago
S$386
Return
found 6 days ago
Select Delta flight, departing Thu, 19 Feb from Seattle to Washington, returning Thu, 26 Feb, priced at S$386 found 6 days ago
Delta
Sat, 28 Feb - Thu, 30 Apr
SEA
Seattle
IAD
Washington
S$397 Return, found 3 days ago
S$397
Return
found 3 days ago
Select Delta flight, departing Sat, 28 Feb from Seattle to Washington, returning Thu, 30 Apr, priced at S$397 found 3 days ago
American Airlines
Sat, 28 Feb - Thu, 30 Apr
SEA
Seattle
IAD
Washington
S$423 Return, found 3 days ago
S$423
Return
found 3 days ago
Select American Airlines flight, departing Sat, 28 Feb from Seattle to Washington, returning Thu, 30 Apr, priced at S$423 found 3 days ago

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

February is typically the cheapest month to fly

From S$206 - S$384 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 S$257. 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 cancelled 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 kilometres. 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

Origin airport
Seattle - Tacoma Intl.
Destination airport
Washington Dulles Intl.
Return price
S$257
Distance
3679 km
Average flight time
7 hours 57 mins

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Perfect flights from Seattle to Washington

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

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