The calculated distance (air line) between San Martino Buon Albergo and Modena is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Modena is certainly longer, as only the direct route (as the crow flies) between San Martino Buon Albergo and Modena has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles