The calculated distance (air line) between Santiago Cuautlalpan and Tlalnepantla is approximately 21 miles respectively 33 kilometers.
By car or train, the actual journey to Tlalnepantla is certainly longer, as only the direct route (as the crow flies) between Santiago Cuautlalpan and Tlalnepantla has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles