Cheap Alaska Airlines flights Washington (IAD) to Seattle (SEA)

You can discover affordable round-trip Alaska Airlines flights from IAD to SEA by filtering your results from “Price (lowest to highest)” on Expedia. Or search for options for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the most affordable months to jet away to Seattle with Alaska Airlines. You could also find great deals on return and one-way fares in February.

Start searching one to three months ahead of your travel date to get cheaper fares on Alaska Airlines flights from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Nail your timing, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Hop on one of Alaska Airlines’s 7 weekly direct flights from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA). To see your options, enter your dates, destination and origin and hit search. Next, apply the “Nonstop” and “Airline” filters.

It takes approximately 6h 3m to travel nonstop from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA) with Alaska Airlines.

Jetting off from IAD at 6:57PM UTC-5, the first Alaska Airlines flight to SEA lands at 10:00PM UTC-8. Traveling earlier in the day means you’ll be less likely to experience delays.* Prefer to travel later? The last Alaska Airlines flight from IAD to SEA departs at 6:57PM UTC-5 and touches down at 10:00PM UTC-8.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Jump on an Alaska Airlines flight from Washington Dulles Intl. Airport (IAD) to Seattle, and you’ll probably come in to Seattle - Tacoma Intl. Airport (SEA). This is the airline’s primary hub here.

Offering a rewarding loyalty program and top-tier customer service, Alaska Airlines is a top choice for many travelers heading from IAD to SEA. Plus, if you’re a Mileage Plan and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be put toward future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Alaska Airlines typically flies Boeing 737-900 planes for flights from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA). This airline also operates the Boeing 737 MAX 9 on this route. Bear in mind that aircraft type can vary due to operational requirements, so the plane you board might be different when you travel.

Changes are typically free within 24 hours of making a booking, but your airline may charge you after that. For further details about altering your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the freedom to adjust your plans without additional charges, apply the “Changes included” or “No cancel fee” filter when organizing your trip.