When changing your flight, you will need to provide your booking reference number and personal information to verify your identity. You will also need to select your new flight dates and times, and pay any applicable change fees or fare differences. Air Canada Change Flight allows passengers to make changes to their flight itinerary, subject to the fare rules of their ticket. If you booked a refundable ticket, you can change your flight at any time without incurring additional fees. However, if you booked a non-refundable ticket, you may be subject to a change fee.