Connecting Flights -- The airport authority advises you to allow a minimum of 45 minutes to make a flight connection; this should be adequate if you arrive and depart from the main terminal and do not have to clear Customs.
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A 12-hour layover means you can really explore Athens. Once you've seen the Acropolis, you may want to explore its archaeological treasures in the state-of-the-art Acropolis Museum, which can easily eat up two hours of your time.
For international layover flights booked on one airline, two hours is often recommended to make your connection. For international flights on different airlines, the connection time will need to be even greater as you may have to change terminals between the two flights.
If you missed your connecting flight due to a short layover, the airline will book you on the next flight free of charge as long as the connecting flight is part of the same ticket.
If a delay in your first flight is the reason you're missing your connection, don't worry too much. Usually, most airlines will rebook you on the next flight, and that too for free. Although, you might have to fly on standby depending on seat availability.
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.
You will go through customs when exiting your destination airport, not when transiting. Usually, in Schengen airports, going through customs doesn't involve much. You may not even notice it. Just pass through a door under a green sign that says something to the tune of “nothing to declare.”
Generally speaking, most airlines will make some kind of efforts to wait for delayed passengers on a connecting flight, though this is not necessarily guaranteed. In some cases, airlines may be able to hold a connecting flight for a period of time, but it is not something that is typically guaranteed by any airline.
What should I do if I miss my connection? You just arrived at your connecting airport and seen that your next flight has already left without you. In most cases you have the right to be rebooked on the next available flight, or ask for a refund and flight back to your point of departure.
What happens if a flight is delayed and you miss your connection? If you miss your connection due to a delay, usually the airline is responsible for providing you with a replacement flight to your destination. They will have to book you on the earliest possible flight available.
You generally can't receive a refund on a missed flight. Depending on the circumstances of your situation and the terms of your fare, you may receive partial credit or free rebooking, but the only way you're likely to get a full refund is if the airline cancels your flight.
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.
That way if you are delayed, you don't need to worry about making your next flight. If you can't avoid connecting, don't book the shortest layover, because you'll be building in stress and the possibility of missing your flight. A one-hour layover is not enough anymore. Thirty minutes, not a chance.
But many travel advisers say those guidelines result in itineraries that don't always work for passengers. “On average, 35 minutes is what they consider a legal connection,” said Loulu Lima founder of the Texas-based travel agency Book Here Give Here.
The whole thing is pretty well organized and unless you happen to arrive at the same time as bunch of other flights you should be through customs and out the door within 20 minutes of your arrival.