There are two options to reach to Rome's central Termini Station by rail. The Trenitalia Leonardo Express whisks passengers from Fiumicino Airport to Rome Termini in 30 minutes for €14, departing about every 30 minutes. The Metro's Sabina-Fiumicino line (FR1) costs €8 and takes 45 minutes. The Metro leaves every 15 minutes and makes more stops along the way, including Tiburtina, Tuscolana, Ostiense, and Trastevere.
NCC Rome offers a private car service with driver for 1 to 4 passengers for a fixed price of €40 to downtown Rome. Travel times can vary depending on the level of Rome's famously bad traffic, but count on 30 to 60 minutes. Find NCC.Roma in front of the airport exit.