The calculated distance (air line) between Saltillo and San Nicolás de los Garza is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to San Nicolás de los Garza is certainly longer, as only the direct route (as the crow flies) between Saltillo and San Nicolás de los Garza has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles