The nearest airport is MXP - Milano Malpensa, located 12.5 km north east of Castelletto.
Other airports nearby include LUG - Lugano (53.3 km north east), LIN - Milan Linate (56.3 km east), TRN - Torino (84.6 km south west), BGY - Bergamo Orio Al Serio (88.0 km east),