As of my last knowledge update in January 2022, Turkish Airlines' cancellation fees may vary depending on the type of ticket, fare rules, and the time of cancellation. Airlines often have different policies for refundable and non-refundable tickets. Generally, if you cancel a non-refundable ticket, you may not be eligible for a refund, and the cancellation fee can be significant.

For specific and up-to-date information on Turkish Airlines cancellation fee, it is recommended to check their official website or contact their customer service directly. Airlines may update their policies, including fees, to adapt to industry changes or unforeseen circumstances. Always review the terms and conditions associated with your ticket before making any changes to understand the applicable fees and conditions.