The air canada flight change policy allows travelers to make modifications to their bookings, often without penalty, depending on the fare type. If you purchased a flexible fare, you may be eligible for free changes. Basic fares, however, are more restrictive and may not permit alterations at all. For all changes, any fare difference must be paid by the passenger. It's advisable to review the policy and your fare conditions before making any decisions to change flights. Read more : https://www.flightaura.com/flight-change-policy/air-canada-change-flight-policy/