Naples Airport has only one relatively small and often very congested terminal. The other terminal 2 is only used for VIP flights.
However, it is not difficult to find your way around. Departures are in the main entrance in the front, while arrivals are in the side building on the left if you are looking at the terminal from the outside. But the whole building is compact and the distances are very small.
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In the morning and early evening, be at the airport at least 2 hours before departure as there are often long queues for security checks.
Transfer between flights
Naples airport is not a transfer airport and if you do have to change flights here, it will usually be made up on your own from two different tickets.
When making such a transfer, you will always have to go out, check in again and go through security back to the transit area.
Overnight in the terminal
Opening hours are from 3:30 to 24:00 and it is not possible to spend the night inside the terminal.