https://central.xero.com/s/question/0D58V00009MoIItSAN/can-i-cancel-my-allegiant-flight-without-a-penalty Can I cancel my Allegiant flight without a penalty Yes, in some cases, you can cancel your Allegiant flight at +1-833-816-0098 without incurring a penalty. If you cancel within 24 hours of booking and your flight is scheduled at least a week in advance, you won't be charged a fee