Athens Airport's LayoutAthens International Airport has two terminals known as the “main terminal” and the “Satellite” terminal. The two terminals are connected through an underground link.
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Main TerminalHall A is used for flights to Non-schengen countries and Non-European countries. Hall B handles flights to Intra-schengen countries as well as domestic services.
The two ATH airport terminal buildings are connected via an underground passage. Thus, transferring from one terminal to the other is generally considered hassle-free. Conveniently, the between-the-terminals corridor is also equipped with moving walkways.
I'd say leave 2 1/2 to 3 hours between flights, especially if you need to go through immigration and/or if you have checked luggage. Also, not sure if it is a good idea driving to Nafplio after a long flight plus jetlag. Much easier to fly to an island!
Yes, a security check is mandatory when you take a connecting flight. This is because there is a time lag between getting off one aeroplane and getting on-board another to reach your destination.
How long is customs in Athens? As a general rule 1hr is usually more than enough to clear immigration and get your bags unless there's a huge number of inbounds at the same time. I'd say you're OK with 2 hours between flights everything by going well with more time obviously better.
If you checked a bag, you'll have to collect it from baggage claim from the international flight. You'll need to clear customs and immigration. Next, you'll recheck your luggage for the domestic flight.
How do I find out my flight's terminal? To find out your flight's terminal, you generally just need to check your airline confirmation or flight itinerary. This can be found either in your email confirmation, or on the airline's website closer to the day of departure.