To save up to 17% on this flight, we recommend booking at least 51 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Great Falls to Peru from $615 1-2 weeks out and tickets from $641 for flights departing within the next 72 hours.
Flights from Great Falls to Peru lean towards being more expensive in December. Prices are generally better when you fly from Great Falls to Peru in August, with the cheapest ticket starting at $218.