The calculated distance (air line) between San Juan Coajomulco and San Luis Potosí is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to San Luis Potosí is certainly longer, as only the direct route (as the crow flies) between San Juan Coajomulco and San Luis Potosí has been calculated here.
Air line (approximately)
286 kilometers
155 nautical miles