If you booked your Allegiant flight within the last 24 hours and the departure is more than seven days away, you can cancel it without incurring a penalty. Outside of this window, a cancellation fee may apply. To cancel, access your Allegiant account, select your booking, and proceed with the cancellation steps. Double-check Allegiant’s terms before canceling to ensure you meet the requirements. Head to Allegiant’s site to complete the cancellation process today.