Allegiant Airlines provides incredibly low-cost flights within the USA. The airline consistently strives to provide the best services to its customers. Allegiant provides many amazing services that you are free to add to your itinerary in order to make your trip hassle-free and seamless. To take advantage of the benefits of some services, you might have to pay a fee. One of the services provided is a cancellation policy for Allegiant Air. Do not worry if your plans suddenly change due to unavoidable circumstances; Allegiant gives customers the option to cancel their reservations even up until the last minute and without incurring additional fees.