You have the option of cancelling your flight if you have purchased a ticket with Allegiant Air but are unable to go for serious personal reasons. However, there are a few guidelines that are part of the Allegiant Air Cancellation Policy that each passenger needs to be aware of. The steps listed below should be followed if you wish to find out, too:

Within 24 hours of the scheduled departure of the flight, passengers may cancel their reserved trips.
Any cancellation of a flight is always subject to a cost, which varies according on the itinerary or route.
You can easily cancel your flight with no fees and a full refund if it is delayed for longer than three hours.

Read also : Delta Airlines Cancellation Policy | Alaska Airlines Cancellation Policy