Policies regarding the cancellation of flights with airlines can be tricky at times, and that is why passengers should be aware of Turkish Airlines (THY) policies before planning their through trips. Turkish Airlines, as the international carrier, has a systematized policy, which depends on several reasons, including the fare rule, the time of the cancellation, and the way the flight disruption happened. Fundamentally, the cancellation policy of Turkish Airlines is not universal. The fare rules that come with your purchased ticket have an important influence on which terms of refunds and fees apply. Various fare classes (e.g, Economy, Business, branded fares) are provided with different types of conditions concerning cancellation and modifications. Other promotional or low-economy tickets may be in non-refundable form, that is, they may only refund the taxes upon cancellation, and the full flight ticket may be charged off. 

The 24 Hour Free Cancellation Period
Another great advantage possessed by Turkish Airlines is that it has a free cancellation within 24 hours. This gives passengers the power to cancel their tickets without the fact they have to pay a penalty fee as long as the cancellation is made within 24 hours after the booking and the departure of the flight has to be at least 7 days in the future. This policy applies mainly to the tickets, which were obtained by using the Turkish Airways online environment (website or application). It presents a lenient window of time that allows passengers to decide about their plans right after booking them with no consequence on their finances. It should be mentioned, though, that the so-called optional services (additional luggage or seat choosing), bought along with the ticket, are not covered by this free refund.

Refunds and cancellation fees: Past the 24 hours, there is usually a fee charged for cancellations. The deduction will be of an amount based on several things:

• Cancelling Time: The unusual thing with the cancellation charges is that the closer the time to departure, the higher the cancellation charges. As an example, it is possible to cancel a domestic flight 12 or more hours before the flight with a deduction estimated as TRY 1450, and closer to the time of departure, i.e., 1 -12 hours to the domestic flight, to count the higher penalties (e.g., TRY 300-400).
•  Fare Class: Somefare classes stated as non ref because of some fare such as Q/ T/ L/ V/ P/ W/ U / F in certain categories. Whenever international tickets are partially used, the level of refund is calculated using international fare rules based on the deduction of the cost of the flown element.
•  No-show Policy: In case a passenger does not appear on a flight (no-show), the ticket tends to be non-refundable unless a part of the ticket cost is to be returned (airport taxes). 

Final words.

When it comes to Turkish Airlines cancellation policy, then each time, it is always better to check the concrete fare regulations applicable to your ticket, which are typically available on your booking confirmation or by using the "Manage Booking" facility on the Turkish Airlines website.