Fly into Fiumicino - Leonardo da Vinci Intl. Airport (FCO), the closest airport, located 17.2 mi (27.8 km) from the city center. If you can't find a flight that's convenient for your trip, you might consider flying into Ciampino Airport (CIA), which is 19.4 mi (31.3 km) away.
If you're traveling by train, you can make your way to Olgiata Station.