No matter how well you plan your entire trip, picking the right flight at the last minute will make all the difference. Having a backup plan will also be helpful in case things don't go as planned. The entire ticket cancellation process should be completed with a refund after being aware of Allegiant Airlines cancellation policy. You can save time and money by making a strategy in advance. According to Allegiant's airline cancellation policy, customers have 24 hours from the time of purchase to cancel their reservations. Actually, there is no cancellation fee levied by the airline, and refunds are given using the original payment method. The airline will deduct a $75 cancellation fee from the entire price of your ticket if you cancel it after 24 hours and return the remaining funds to your credit card, which you can use to book future trips with Allegiant Airlines. If you miss or cancel your flight less than a week before departure, Allegiant Airline will not issue refunds or credits.