The incident occurred as the aircraft was flying over Belarus, CNN Turk quoted Binali Yildirim, Turkey's transport minister, as saying.
The man, who was said to be drunk, handed a flight attendant a note for the pilot reading, "I have a bomb. If you don't take me in [the cockpit] I will blow it up", Temel Kotil, Turkish Airlines director, told Anatolia news agency.
"The man then attempted to walk towards the cockpit ... and was overpowered by passengers." He was found to be carrying no explosives.