If you have a reservation with Allegiant Air and are unable to fly for important personal reasons, you have the option of cancelling your flight. However, the
Allegiant Air Cancellation Policy has specific guidelines that each traveller should be aware of. If you're curious as well, just follow these steps:
Within 24 hours of the booked flight's scheduled departure, passengers may cancel their reservations.
There is always a cancellation cost associated with cancelled flights, and it varies by route or trip.
If your flight is delayed for longer than three hours, you can easily cancel it with no fees and receive a full refund.
Visit also : Delta Airlines Cancellation Policy