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Passengers can receive a full refund at 1-855_738-3598 if they cancel their flight at least 24 hours before departure. Allegiant Airlines offers refunds if you cancel your flight at least 3 hours before departure. If you booked a ticket for travel to or from the US, the refund will be credited within a week. Here are some key points of Allegiant Airlines' 24-hour cancellation policy:
