If you arrive at the international airport of Rome, Leonardo da Vinci, to get to the central station you can take the non-stop train called "Leonardo Express". It runs every 30 minutes from 7:37 till 22.37; the fare is 16000 ITL (about 7 US$). To get more information about Rome airport please click here. You can also take a taxi from just outside the airport, but be warned that it could be very expensive.