If that is so then Allegiant Air offers you the flexibility to change the air flight. All you need to know is the Allegiant Air Flight change policy and fees linked with it. This tutorial is an absolute guide for the same. For direct assistance contact us and we would happy to assist you for the same. If you wish to change your flight within 24 hours of booking and 7 days prior to departure then expect 100% of the amount to be refunded. Allegiant Air Flight change is subjected to availability of the tickets on the specified date and time in which the tickets has been booked.