Allegiant Air's standard cancellation policy is non-refundable, with some exceptions for cancellations made within 24 hours of booking or for those who purchase the optional Trip Flex travel waiver. Outside of these specific circumstances, canceled flights will typically result in a credit voucher, and not a refund to your original payment method.
Standard cancellation rules
24-Hour Cancellation: You can receive a full refund to your original payment method if you cancel your flight within 24 hours of purchase. This applies as long as the booking was made at least seven days (168 hours) before your scheduled departure.
Beyond 24 Hours: After the 24-hour window, the ticket is generally non-refundable. Any future travel credit will be issued as a credit voucher, less any applicable cancellation fees.
Non-Refundable Tickets: As Allegiant's standard fares are non-refundable, canceling a ticket after 24 hours of booking will not get you a refund.
Trip Flex: The optional travel waiver
Allegiant offers a Trip Flex