The calculated distance (air line) between Naucalpan de Juárez and San Juan del Río is approximately 80 miles respectively 128 kilometers.
By car or train, the actual journey to San Juan del Río is certainly longer, as only the direct route (as the crow flies) between Naucalpan de Juárez and San Juan del Río has been calculated here.
Air line (approximately)
128 kilometers
69 nautical miles