The airline's ticket refund policy states that you can cancel your eligible tickets for free and receive a full refund within 24 hours of booking if you do so within that time frame. The flight must, however, depart at least seven days after that time.
Imagine you want to cancel and then request a refund after 24 hours. The cancellation fee will then be taken from the price of your original ticket if you fail to pay it.
Additionally, any additional expenditures like luggage, hotels, transportation costs, or taxes will still be non-refundable if your booking doesn't meet the conditions.
Subject to Allegiant Airlines refund policy, the remaining credit from the cancelled ticket is refunded as a future travel voucher.
Travel security bookings made through Trip Flex require passengers to request the appropriate amount of return credit based on the timing of their booking and cancellation.

Visit also : Delta Airlines refund policy