Allegiant Airlines Flight Cancellation policy allows passengers to cancel trips upto 24 hrs to the flight.Cancellation is free if you booked your flight and wish to cancel it within 24 hrs but more than 7 days prior to the flight (OR) In all the other cases allegiant flight cancellation may Charge a cancellation fee of $75 Per ticket.Cancellation policies are being ever-changing due to COVID-19, for latest updates on Allegiant policies over all aircrafts, please contact our customer support number at +1 (702) 765-4833.