The calculated distance (air line) between Calderara di Reno and San Lazzaro is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to San Lazzaro is certainly longer, as only the direct route (as the crow flies) between Calderara di Reno and San Lazzaro has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles