Online check-in for Turkish Airlines BGY Terminal begins 24 hours prior to the departure of your trip and is open until 90 minutes before takeoff. For international flights, in-person airport check-in usually opens three hours before departure, giving plenty of time for boarding and security checks. To guarantee a seamless experience, Turkish Airlines advises getting to the airport at least three hours prior to international flights and two hours prior to domestic flights. Always check the time with the airport where you are departing.