From Milano Centrale train to Genova Piazza Principe then train to Arenzano. 2 h 30 min 33€. From Milano Centrale train to Arenzano. 2 h 35 min 13€. From Milan drive to Arenzano. 1 h 32 min 23€.
Train from Milan to Arenzano
Trenitalia Eurocity operates a train from Milan to Arenzano hourly. Tickets cost $30 - $45 and the journey takes 1 h 32 min. Trenitalia also services this route hourly.