S$178 Cheap Flights from Seattle to Washington

View S$178 flight on Tue, 12 Aug, 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$178 for one-way flights and S$383 for return, for the period specified. Prices and availability are subject to change. Additional terms apply.
Delta
Tue, 22 Jul - Tue, 29 Jul
SEA
Seattle
IAD
Washington
S$383
Return
Found 6 days ago
Select Delta flight, departing Tue, 22 Jul from Seattle to Washington, returning Tue, 29 Jul, priced at S$383 Found 6 days ago
Delta
Sun, 3 Aug - Tue, 12 Aug
SEA
Seattle
IAD
Washington
S$410
Return
Found 5 days ago
Select Delta flight, departing Sun, 3 Aug from Seattle to Washington, returning Tue, 12 Aug, priced at S$410 Found 5 days ago
Delta
Mon, 4 Aug - Tue, 12 Aug
SEA
Seattle
IAD
Washington
S$434
Return
Found 6 days ago
Select Delta flight, departing Mon, 4 Aug from Seattle to Washington, returning Tue, 12 Aug, priced at S$434 Found 6 days ago
United
Thu, 7 Aug - Wed, 13 Aug
SEA
Seattle
IAD
Washington
S$435
Return
Found 3 days ago
Select United flight, departing Thu, 7 Aug from Seattle to Washington, returning Wed, 13 Aug, priced at S$435 Found 3 days ago
Delta
Wed, 9 Jul - Mon, 14 Jul
SEA
Seattle
IAD
Washington
S$446
Return
Found 1 day ago
Select Delta flight, departing Wed, 9 Jul from Seattle to Washington, returning Mon, 14 Jul, priced at S$446 Found 1 day ago
American Airlines
Tue, 22 Jul - Tue, 29 Jul
SEA
Seattle
IAD
Washington
S$447
Return
Found 6 days ago
Select American Airlines flight, departing Tue, 22 Jul from Seattle to Washington, returning Tue, 29 Jul, priced at S$447 Found 6 days ago
United
Thu, 7 Aug - Wed, 13 Aug
SEA
Seattle
IAD
Washington
S$448
Return
Found 3 days ago
Select United flight, departing Thu, 7 Aug from Seattle to Washington, returning Wed, 13 Aug, priced at S$448 Found 3 days ago
Delta
Wed, 9 Jul - Mon, 14 Jul
SEA
Seattle
IAD
Washington
S$458
Return
Found 1 day ago
Select Delta flight, departing Wed, 9 Jul from Seattle to Washington, returning Mon, 14 Jul, priced at S$458 Found 1 day ago
United
Tue, 22 Jul - Tue, 29 Jul
SEA
Seattle
IAD
Washington
S$461
Return
Found 6 days ago
Select United flight, departing Tue, 22 Jul from Seattle to Washington, returning Tue, 29 Jul, priced at S$461 Found 6 days ago
Delta
Tue, 22 Jul - Tue, 29 Jul
SEA
Seattle
IAD
Washington
S$473
Return
Found 6 days ago
Select Delta flight, departing Tue, 22 Jul from Seattle to Washington, returning Tue, 29 Jul, priced at S$473 Found 6 days ago
Seattle to Washington route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, United
Return price
S$382
Distance
3679 km
Average flight time
8 hours 1 min

Perfect flights from Seattle to Washington

Your Journey from Seattle to Washington

Start your unforgettable journey with Expedia. Our broad selection of flights from Seattle to Washington 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, American Airlines, United. Our selection of flights from Seattle - Tacoma Intl. to Washington Dulles 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 Seattle to Washington Flights

Experience the joy of finding cheap flights from Seattle - Tacoma Intl. to Washington Dulles Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$178 and roundtrip prices from S$383*.
 

Pre-Flight Essentials

Ensure a smooth journey from Seattle to Washington 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 Washington

Picture yourself stepping off the plane in Washington and immersing yourself in the unique atmosphere of Chantilly. 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 Seattle to Washington 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 Seattle to Washington.
 

Beyond the Flight – Exploring Washington

With Expedia, your adventure extends beyond the flight. Explore Washington 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 Seattle to Washington 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 Seattle to Washington 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 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$383. 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.

Explore a world of travel with Expedia

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