Up to this point, the three most popular transportation options to Rome’s city center from the main Leonardo DaVinci Fiumicino Airport have been:
the standard taxi ride, that will run you upward of €50 one way.
the ‘Leonardo Express’ train that brings you to Rome’s Termini Station for about €14 each way.
a Cotral Bus, which will also bring you to Rome’s Termini or Tiburtina Station for about €4.50 each way
However, Alitalia has introduced their own new bus service for getting to the center of Rome.