Frontier airlines cancellation policy varies depending on the type of fare purchased. Passengers should review the policy at the time of booking and before canceling their reservation to ensure they understand any fees or restrictions that may apply. Passengers who cancel their reservation within 24 hours of booking or who purchase Trip Protection may be eligible for a full refund. In the event that Frontier Airlines cancels a flight, passengers are entitled to a full refund or the option to be rebooked on another available flight at no additional cost.