The calculated distance (air line) between Terno d'Isola and Osio Sotto is approximately 6 miles respectively 9 kilometers.
By car or train, the actual journey to Osio Sotto is certainly longer, as only the direct route (as the crow flies) between Terno d'Isola and Osio Sotto has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles