How to modify your Air Canada flight plans and get a refund? According to the Air Canada Flight Cancellation Policy, cancellations are absolutely free up to 24 hours after booking and 7 days before to the scheduled departure. Both online and offline, there are numerous cancellation options. You can cancel your ticket right now by entering into your account on the Air Canada website or by phoning their customer support hotline number and requesting for cancellation. Once the procedure has been successfully completed, you will receive an email of confirmation, and your refund will be paid to your account within 7 to 10 days.