Turkish Airlines has a flexible flight change policy that allows customers to modify their domestic or international flight reservations. For changes made more than 24 hours after booking or between March 21, 2020 and December 31, 2021, no change fee will be charged. However, changes on the departure date are not permitted and a penalty will be charged. Customers can make changes to their flights online through the Turkish Airlines website or mobile app, or offline by visiting the airport ticket counter or calling customer service.