You can create changes to your flight booking up to one hour before departure, and up to seventy-two hours before departure. If you're itinerary changes when the engaged your flight confirmation with the airline. Allegiant Airlines travelers can have multiple choices to boost the price tag amendment request. According to the allegiant flight change policy, the passengers will create any alterations to their tickets for complimentary at intervals of twenty-four hours of booking. Once it involves creating changes for flights with allegiant Airlines, there are a number of rules you must bear in mind.