From Roma Ciampino Airport to Roma Termini (= Rome´s main trainstation) by Ciampino Airlink:
You first need to take the red Airlink bus to Ciampino train station, whereafter you take the train to Termini.
Ciampino is a very small airport. The AIRLINK bus departs right in front of the airport.
Please note that there are different bus companies offering bus rides directly to Termini station (45 minutes) but we´ve experienced the Airlink bus+train ride as more pleasant.
You can buy the Airlink-ticket in the automatic ticket machine right behind the luggage delivery.
Please note: Tickets bought in a self service ticketing machine are valid for 2 months, so it is important to devalidate it in one of the validation machines on the platform before entering the train. It is not possible to do so on the train. Be sure you hear a ”click” and check the printed date.