Cheap Alaska Airlines flights Seattle (SEA) to Helena (HLN)

You'll find cheap round-trip Alaska Airlines flights from SEA to HLN by filtering your results from "Price (lowest to highest)" on Expedia. Or look for bargains for a one-way journey.**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.

Begin your search one to three months ahead of your departure date to score cheaper fares on Alaska Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to Helena Regional Airport (HLN). 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 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.* Get your 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.

The earliest Alaska Airlines flight from SEA to HLN takes off at 1:29PM UTC-8, touching down at 4:04PM UTC-7. If you want to set off later, the last Alaska Airlines flight leaves SEA at 1:29PM UTC-8 and lands at HLN at 4:04PM UTC-7. Flying early is often a wise choice as morning and mid-morning flights are less likely to experience cancellations.**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.

With a rewarding loyalty program and an excellent in-flight experience, Alaska Airlines is a top choice for many travelers flying from SEA to HLN. Also, 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 spent on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.