The calculated distance (air line) between Naucalpan de Juárez and San Miguel de Allende is approximately 139 miles respectively 224 kilometers.
By car or train, the actual journey to San Miguel de Allende is certainly longer, as only the direct route (as the crow flies) between Naucalpan de Juárez and San Miguel de Allende has been calculated here.
Air line (approximately)
224 kilometers
121 nautical miles