If your connection s within IST, two hours is a safe bet (though the official minimum is one hour). If you'll need to transfer between airports, anything less than four hours will make for a stressful connection.

A 2-hour layover at Istanbul Airport (IST) is generally considered the minimum safe window for a smooth international transfer, but it leaves very little room for error. IST is one of the largest and most sprawling airports in the world; walking from a gate in Pier A to a gate in Pier F can easily take 20 to 25 minutes of brisk walking. If your incoming flight is on time and you are traveling on a single ticket with Turkish Airlines, your luggage will be checked through, and you won't need to clear customs, which makes the 2-hour window manageable. However, if your first flight is delayed by even 30 minutes, or if you have to clear security for an "unsecured" connection, you will likely find yourself sprinting to make your boarding gate, which usually closes 20 minutes before departure. In 2026, it is recommended to aim for a 3-hour layover to account for the massive scale of the terminal and the high volume of passengers, ensuring you have time to navigate the central "Duty Free" hub and use the "buggy" transport services if you are assigned a distant gate.