The calculated distance (air line) between San Luis Potosí and Ciudad del Maíz is approximately 90 miles respectively 144 kilometers.
By car or train, the actual journey to Ciudad del Maíz is certainly longer, as only the direct route (as the crow flies) between San Luis Potosí and Ciudad del Maíz has been calculated here.
Air line (approximately)
144 kilometers
78 nautical miles