Fiumicino Airport (FCO): it is about 25 – 30 km from the city center. By car or taxi it takes about 25–40 minutes (depending on traffic), or 32 minutes by direct train Leonardo Express from Termini Station.
Ciampino Airport (CIA): it is about 15 – 20 km. By taxi or shuttle buses, it takes about 25–40 minutes.
In Metro/Public Transport: Most of the main attractions (Colosseum, Trevi Fountain, Piazza di Spagna, Vatican Museums) are within a few minutes or a few metro stops away.
On foot: The attractions in the historic center (e.g. Pantheon, Navona, Campo de’ Fiori) are often only a few hundred meters apart from each other.