For passengers flying with Turkish Airlines flight number TK1756 from Lisbon Airport (LIS-Humberto Delgado) to Istanbul Airport (ISL-Ataturk Intl.), 90% of these journeys run as scheduled. On the rare occasion that there is a delay, your likely wait is roughly 40 minutes on average. Thanks to the airline’s quality service, this service has earned a star rating of 2.9.