The calculated distance (air line) between San Luis Potosí and San Pedro Piedra Gorda is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to San Pedro Piedra Gorda is certainly longer, as only the direct route (as the crow flies) between San Luis Potosí and San Pedro Piedra Gorda has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles