I don't have real-time information on specific airline policies, including Turkish Airlines cancellation policy. However, the ability to cancel a flight for free often depends on the type of ticket you purchased and the airline's specific terms and conditions.

Typically, airlines offer different fare classes, each with its own set of rules regarding cancellations, changes, and refunds. Some tickets may be non-refundable, while others may allow for free cancellations within a certain timeframe.

To determine whether you can cancel Turkish Airlines flight for free, you should check the terms and conditions of your ticket. This information is usually available on the airline's website or in the documentation you received when you booked the flight. Additionally, you can contact Turkish Airlines customer service for the most accurate and up-to-date information regarding your specific booking.