Turkish Airlines allows date changes, but whether or not they are free depends on your fare type. Fully flexible tickets generally permit free changes, whereas more restrictive economy fares may charge a fee. Additionally, Turkish Airlines often runs promotions where changes within a certain period are allowed without any extra cost. To check if you qualify for a free date change, log in to your booking and review the fare conditions. Always remember that you may have to pay any fare difference for the new dates.
Source: https://www.devex.com/people/can-you-change-dates-on-turkish-airlines-policy-2025449
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