The calculated distance (air line) between Monza and Cassina de' Pecchi is approximately 6 miles respectively 10 kilometers.
By car or train, the actual journey to Cassina de' Pecchi is certainly longer, as only the direct route (as the crow flies) between Monza and Cassina de' Pecchi has been calculated here.
Air line (approximately)
10 kilometers
5 nautical miles