The calculated distance (air line) between San Martino Buon Albergo and Monza is approximately 89 miles respectively 143 kilometers.
By car or train, the actual journey to Monza is certainly longer, as only the direct route (as the crow flies) between San Martino Buon Albergo and Monza has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles