Air Canada's 24-hour cancellation policy allows passengers to cancel their flight within 24 hours of booking and receive a full refund, provided the booking was made at least seven days before departure. This policy applies to all ticket types, including non-refundable fares. After the 24-hour window, cancellation fees may apply, and refunds are typically issued as travel credits. Cancellations can be made online, via the mobile app, or by contacting Air Canada customer service.