The calculated distance (air line) between Trezzo sull'Adda and Osio Sotto is approximately 4 miles respectively 6 kilometers.
By car or train, the actual journey to Osio Sotto is certainly longer, as only the direct route (as the crow flies) between Trezzo sull'Adda and Osio Sotto has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles