To save up to 17% on this flight, we recommend booking at least 17 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Kalispell to Oregon from $104 1-2 weeks out and tickets from $129 for flights departing within the next 72 hours.
Due to multiple factors, expect to potentially pay more when booking in December. For low rates, April can be a great choice for travel to Oregon. Flights to Oregon from Kalispell in April are about $112 on average during April, but can be found for as low as $41.