• All passengers may modify their flights according to the guidelines in the policy below by adhering to Allegiant Air flight modification policy.
• All flight changes must be made by the traveller seven days prior to the scheduled departure without using the travel flexibility option.
• For all changes, Allegiant charges a $75 per-trip flight modification fee.
• Each and every change is non-transferable and non-refundable.
• Travel credits have a two-year expiration date and cannot be renewed after that point.
• Up to an hour prior to departure, travellers who book using the travel flexibility function are free to change their flights.
• Changes to travel arrangements may be made by Byer up to 72 hours before to departure. A discrepancy in ticket prices is a non-refundable element.
• Within 24 hours of ticket purchase, every requested flight adjustment or cancellation is absolutely free.
• A travel voucher is granted to passengers who modify their flexible travel option.

Read also : Alaska Airlines flight modification policy | Air Canada flight modification policy