British Airways cancellation fee vary depending on the type of ticket purchased and the fare rules associated with it. Generally, the airline offers different fare categories, each with specific cancellation policies. For some non-refundable tickets, a cancellation fee may apply if you decide to cancel your booking. This fee can range from a fixed amount to a percentage of the ticket's total cost. However, for more flexible or refundable tickets, the cancellation fee might be lower or waived altogether. To determine the cancellation fee applicable to your reservation, it's essential to review the fare rules and conditions stated on your ticket or consult with British Airways' customer support.