The calculated distance (air line) between Ariano Irpino-Martiri and Salerno is approximately 37 miles respectively 60 kilometers.
By car or train, the actual journey to Salerno is certainly longer, as only the direct route (as the crow flies) between Ariano Irpino-Martiri and Salerno has been calculated here.
Air line (approximately)
60 kilometers
32 nautical miles