Turkish Airlines prepared a sheet for Turkish Airlines cancellation charges according to your fare. Economy Promotion fare tickets are non-refundable assuming you have economy advancement fare tickets you are not qualified for any discount after cancellation. No discount is allocated against cancellation to travelers who have Economy Restricted Fare tickets, Economy Flexible Fare tickets, and Business Promotion tickets. For travelers with a Business Restricted fare ticket, they need to pay $400 for the cancellation of tickets. Traveler with Flexible Fare ticket, you are fortunate no cancellation is charged against you by Turkish Airlines.