Can I leave the airport during a layover in Istanbul?
Yes, you can leave airport with a transit stopover flight. According to your country and nationality you may need a transit visa. Do not miss the new airport in istanbul is 1 hour away from downtown. So you need to have at least 5-6 hours layover between 2 flights. If you have that much time, you may go out the city, have some nice food and visit some nice spots like Bosphorus, Old city, Hagia Sophia, Golden horn, Galata..