Cancel Air Canada ticket within 24 hours to get a 100% refund. Air Canada is also applicable for 24-hour return non-refundable fares plus refundable. If you have booked your Air Canada flight, which is flying within 24 hours, however, you can cancel and receive a full refund unless you cancel at least hours before your departure. do. Before becoming free of charge, you should read about the terms and conditions of the Air Canada cancellation policy