S$166 Cheap Flights from Washington to Seattle

View S$166 flight on Tue, 12 Aug, 2025Opens in a new window

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

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Cheap Flights from Washington to Seattle (IAD-SEA)

Prices were available within the past 7 days and start at S$166 for one-way flights and S$330 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$330 Return, found 1 day ago
S$330
Return
found 1 day ago
Select Delta flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$330 found 1 day ago
Delta
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$433 Return, found 1 day ago
S$433
Return
found 1 day ago
Select Delta flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$433 found 1 day ago
Delta
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$446 Return, found 1 day ago
S$446
Return
found 1 day ago
Select Delta flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$446 found 1 day ago
United
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$458 Return, found 1 day ago
S$458
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$458 found 1 day ago
United
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$471 Return, found 1 day ago
S$471
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$471 found 1 day ago
United
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$471 Return, found 1 day ago
S$471
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$471 found 1 day ago
United
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$483 Return, found 1 day ago
S$483
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$483 found 1 day ago
United
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$485 Return, found 1 day ago
S$485
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$485 found 1 day ago
American Airlines
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$496 Return, found 1 day ago
S$496
Return
found 1 day ago
Select American Airlines flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$496 found 1 day ago
United
Wed, 20 Aug - Wed, 27 Aug
IAD
Washington
SEA
Seattle
S$497 Return, found 1 day ago
S$497
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug from Washington to Seattle, returning Wed, 27 Aug, priced at S$497 found 1 day ago

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

May is typically the cheapest month to fly

From S$292 - S$431 per traveller.

Graph displaying average flight prices per month

Washington to Seattle route information
Origin airport
Washington Dulles Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
American Airlines, Delta, United
Return price
S$330
Distance
3679 km
Average flight time
2 hours 48 mins

Perfect flights from Washington to Seattle

Your Journey from Washington to Seattle

Start your unforgettable journey with Expedia. Our broad selection of flights from Washington to Seattle caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including Delta, United, American Airlines. Our selection of flights from Washington Dulles Intl. to Seattle - Tacoma Intl. caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with Washington to Seattle Flights

Experience the joy of finding cheap flights from Washington Dulles Intl. to Seattle - Tacoma Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$166 and roundtrip prices from S$330*.
 

Pre-Flight Essentials

Ensure a smooth journey from Washington to Seattle with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant Seattle

Picture yourself stepping off the plane in Seattle and immersing yourself in the unique atmosphere of . From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your Washington to Seattle Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from Washington to Seattle.
 

Beyond the Flight – Exploring Seattle

With Expedia, your adventure extends beyond the flight. Explore Seattle at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from Washington to Seattle with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from Washington to Seattle with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

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 S$330. 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.

Explore a world of travel with Expedia

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