The bus is the best option, with SITA (tel. 089-405145; www.sitabus.it) offering frequent service from Amalfi.
Taxi service from Naples's Capodichino Airport costs a fixed 135€. Curreri Viaggi (tel. 081-8015420; www.curreriviaggi.it) offers a shuttle from the airport for 150€ for one to three passengers and 12€ for each additional passenger.
By train (tel. 892021 in Italy; www.trenitalia.it), the closest station is Vietri sul Mare, on the local line between Naples (where you'll change trains if you are coming from the north) and Salerno (if you are coming from the south). Your best bet is to alight in Salerno and take a SITA bus or a taxi directly to Ravello.
In summer, another option is taking a ferry. The nearest harbors are Salerno and Amalfi; transfer to Ravello from there.
By car, take autostrada A3 to NAPOLI-SALERNO to the exit VIETRI SUL MARE; then follow signs for VIETRI, AMALFI to the SS 163. Follow signs for RAVELLO up the narrow curvy road. Note: Because of summer traffic, car access to SS 163 is occasionally limited; contact the tourist office before setting out.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.