The calculated distance (air line) between San Diego de la Unión and Ecatepec de Morelos is approximately 174 miles respectively 280 kilometers.
By car or train, the actual journey to Ecatepec de Morelos is certainly longer, as only the direct route (as the crow flies) between San Diego de la Unión and Ecatepec de Morelos has been calculated here.
Air line (approximately)
280 kilometers
151 nautical miles