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.
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Overall, passengers usually have to re-clear security for connecting flights, though there may be some exceptions depending on the airport and flight itinerary. To make this process easier, checking with the airline or airport ahead of time is recommended.
In most cases, airlines recommend allowing at least two hours between connecting flights to ensure that you have plenty of time to make your connection.
Mayers recommends two hours as a standard buffer between flights to be safe. This gives you a cushion in case things go wrong during your journey. You'll definitely want at least a two-hour window if you've booked a “hacker fare,” as opposed to flying with the same airline your entire trip.
The recommended layover time for international flights is generally longer, as you will have to go through customs and immigration before boarding your next flight. In most cases, a 30-minute layover for domestic flights and an hour for international flights is considered a minimum, or short, layover.
It's not uncommon for your bags to make a tight connection while the passenger misses the flight. Here's a link to an example of Air Canada's MCT for various airports. Airlines have their own minimum connection time. Generally speaking an hour should be the minimum.
What is a good connection time? Travel advisers say there's a lot to take into account when booking connecting flights, but a general rule of thumb is 60-90 minutes between domestic flights and at least two to three hours for international itineraries.
If you have a layover and both flights are part of the same itinerary and booked on a single ticket, you typically do not need to check in again. Your checked baggage is usually tagged through to your final destination, and you would proceed directly to your connecting gate after going through security.