To save up to 43% on this flight, we recommend booking at least 52 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Helena to Alaska from $357 1-2 weeks out and tickets from $499 for flights departing within the next 72 hours.
Due to multiple factors, expect to potentially pay more when booking in May. For low rates, August can be a great choice for travel to Alaska. Flights to Alaska from Helena in August are about $351 on average during August, but can be found for as low as $169.