If a traveler requests a cancellation within 24 hours of booking your tickets and at least 7 days before your scheduled departure, VivaAerobus will not charge you any costs. According to the VivaAerobus Cancellation Policy, If boarding has not yet started, cancellations must be requested up to 4 hours ahead to the scheduled departure time and are subject to VivaAerobus flight cancellation fees. As long as the scheduled departure is not more than 24 hours away, travelers may cancel a ticket booked under VivaAerobus' 24-hour cancellation policy. If travelers made the reservation through an official website, you can also cancel there. Additionally, you can cancel the flight via phone or at the airport counter.