NT$4,245 Cheap Flights from Seattle (SEA) to Washington (IAD)

View NT$4,245 flight on Tue, 2025/11/4Opens 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 NT$4,245 for one-way flights and NT$7,273 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Nov 4 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$7,273 Roundtrip, found 2 hours ago
NT$7,273
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Nov 4 from Seattle to Washington, returning Tue, Nov 11, priced at NT$7,273 found 2 hours ago
Delta
Fri, Nov 7 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$7,290 Roundtrip, found 5 days ago
NT$7,290
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Nov 7 from Seattle to Washington, returning Tue, Nov 11, priced at NT$7,290 found 5 days ago
Delta
Tue, Nov 4 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$7,569 Roundtrip, found 2 hours ago
NT$7,569
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Nov 4 from Seattle to Washington, returning Tue, Nov 11, priced at NT$7,569 found 2 hours ago
Delta
Fri, Nov 7 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$7,587 Roundtrip, found 5 days ago
NT$7,587
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Nov 7 from Seattle to Washington, returning Tue, Nov 11, priced at NT$7,587 found 5 days ago
Delta
Tue, Nov 4 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$7,865 Roundtrip, found 2 hours ago
NT$7,865
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Nov 4 from Seattle to Washington, returning Tue, Nov 11, priced at NT$7,865 found 2 hours ago
Delta
Fri, Nov 7 - Wed, Nov 12
SEA
Seattle
IAD
Washington
NT$8,776 Roundtrip, found 5 days ago
NT$8,776
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Nov 7 from Seattle to Washington, returning Wed, Nov 12, priced at NT$8,776 found 5 days ago
Delta
Tue, Nov 4 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$9,667 Roundtrip, found 2 hours ago
NT$9,667
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Nov 4 from Seattle to Washington, returning Tue, Nov 11, priced at NT$9,667 found 2 hours ago
Delta
Fri, Nov 7 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$9,690 Roundtrip, found 5 days ago
NT$9,690
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Nov 7 from Seattle to Washington, returning Tue, Nov 11, priced at NT$9,690 found 5 days ago
American Airlines
Tue, Nov 4 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$10,006 Roundtrip, found 2 hours ago
NT$10,006
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Tue, Nov 4 from Seattle to Washington, returning Tue, Nov 11, priced at NT$10,006 found 2 hours ago
United
Tue, Nov 4 - Tue, Nov 11
SEA
Seattle
IAD
Washington
NT$10,307 Roundtrip, found 2 hours ago
NT$10,307
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Nov 4 from Seattle to Washington, returning Tue, Nov 11, priced at NT$10,307 found 2 hours ago

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 NT$7,273. 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

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Washington Dulles Intl.
Roundtrip price
NT$7,273
Distance
3679 km
Average flight time
8 hours 5 mins

Book with confidence

Book with confidence

Seattle to Chantilly Flights

Sometimes you just need to get out of town or maybe you’re looking for a change of scenery. Regardless of the reason, a flight from Seattle to Chantilly will do just the trick! Go on, plan to see all the famous landmarks and eat your weight in the local cuisine. Your trip is beckoning, so answer the call by packing your suitcase and filling your travel itinerary with exploring Chantilly.

Whether you’re flying for business or jet-setting on your personal time, you’ve come to the right place. Here at Expedia.com, we’ll pair you up with SEA to IAD flights that won’t make your bank account wince. Ready to temporarily leave behind Seattle for new horizons? Browse through our cheap airfare, and filter by flight times and dates until you find just what you had in mind. From flights without layovers to ones that arrive early in the morning, you’ll come across plane tickets that suit your travel preferences. You can even bundle your flight to IAD with hotels and car rentals to score even bigger savings.

All set to hit the clouds? Book your travel arrangements with us today and have left-over money to put toward your travel outings and adventures.

Seattle to Chantilly Flights

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