There are many flights from Rome to Palermo, a few from Milan apart from the international connections.
On the initial and final day, transfers are provided by the Ettore Majorana Centre. At Arrivals, look for the meeting-point poster "Ettore Majorana Centre".
Go to the tourist office in the Arrivals area if you have any problems. Low-cost flights (Ryanair) land in Trapani which is the nearest airport.
Via Milan Rome, you can reach Trapani directly. From Trapani, to reach Erice comfortably, a taxi is suggested. Confirm the price before taking the taxi.
You can view the train schedule here. Remember to use Trapani as your destination
There are two possibilities:
1. Drive along the A1 - Autostrada del Sole via Milan Bologna Florence Rome Naples-Villa San Giovanni (Reggio Calabria); then take a ferry boat from Villa San Giovanni to Messina and drive to Erice (350 km from Messina).
2. Take the ferry boat either from Genoa or Naples to Palermo, and then drive on to Erice (100 km from Palermo). The places on the ferry boat must be booked in advance