No matter which terminal you arrive at, Athens airport is a very easy airport to navigate with signs in both Greek and English, friendly English speaking staff and a very clear layout.
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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.
All passengers on domestic flights regardless of airport of destination no longer require valid certificate of vaccination or recovery from COVID-19, or evidence of a negative test result from a PCR/Rapid test.
Carry your passport or some form of photo identification at all times. Police may detain you for questioning if you do not have proper identification with you.
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.
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.
However, it is immigration -- passport control --- that can take time. There is no immigration in Canada or Turkey if it is just a connection. Connection time at Athens airport. 2 hours is sufficient.
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!
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 common to worry that your layover is too short. And, unfortunately, there isn't an easy way of knowing if your layover will be long enough to make your connection.
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.