The calculated distance (air line) between San Diego de la Unión and Tlalnepantla is approximately 172 miles respectively 277 kilometers.
By car or train, the actual journey to Tlalnepantla is certainly longer, as only the direct route (as the crow flies) between San Diego de la Unión and Tlalnepantla has been calculated here.
Air line (approximately)
277 kilometers
149 nautical miles