The phone number of Turkish Airlines Customer Service is 1800-874-8875. The customer service is available 24 hours to assist you with any queries and you can contact the same number for your flight ticket reservation/cancellation. For feedbacks with regards to the experience, while traveling with Turkish Airlines or share in your opinion or suggestion, you can write to them by visiting the feedback form which is available on the official website. Tracking your lost luggage or baggage delayed status, you will need to visit the Lost Property Office who will provide you the reference number. Use the reference number in the baggage tracking page of Turkish Airlines website to check the status of the baggage. Help is also available through their twitter page and link to the page is provided on this website page.