Due to multiple factors, expect to potentially pay more when booking in December. For low rates, November can be a great choice for travel to Miami. Flights to Miami from Great Falls in November are about $720 on average during November, but can be found for as low as $453.
Friday is generally a great day to depart. Flying on this day could help you save up to 33%.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Great Falls to Miami as you normally would.