$164 Cheap Alaska Airlines flights Harrisburg (MDT) to Seattle (SEA)

You can find affordable round-trip Alaska Airlines flights from $387 from MDT to SEA by organizing your results from “Price (lowest to highest)” on Expedia. Or look for options from $164 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.

Look for round-trip or one-way flights to Seattle in January or February. You could find a cheap fare with Alaska Airlines during these off-season months.

Begin your search one to three months ahead of your departure date to get cheaper fares on Alaska Airlines flights from Harrisburg Intl. Airport (MDT) to Seattle - Tacoma Intl. Airport (SEA). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get the timing right, and you can enjoy significant savings on domestic flights.*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.

Simply enter your dates, click search and check “Nonstop” on Expedia to browse any direct flights from MDT to SEA with Alaska Airlines or other carriers.

To find the earliest departures from MDT to SEA with Alaska Airlines, filter your search by “Early Morning” and “Morning.” Booking an early flight usually means cancellations are less likely.**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.

Seattle - Tacoma Intl. Airport (SEA) is the main Seattle hub for Alaska Airlines flights from Harrisburg Intl. Airport (MDT).

Jetting off from MDT to SEA with Alaska Airlines means enjoying a host of perks, including top-tier customer service and a rewarding loyalty program. Plus, when you book through Expedia, One Key™ members can collect OneKeyCash™* to redeem on select future travel purchases. That’s on top of the Mileage Plan points you can earn with Alaska Airlines.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Typically, you can modify or cancel your flight, although there may be a charge if your booking was made over 24 hours ago. Want to keep your options open? Use our “No cancel fee” or “Changes included” filter to find flights that won’t penalize you if you need to revise your plans. To modify your itinerary, visit “Trips,” select your flight and click on “Manage Booking” for more information.