The calculated distance (air line) between Ecatepec de Morelos and Cuernavaca is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Cuernavaca is certainly longer, as only the direct route (as the crow flies) between Ecatepec de Morelos and Cuernavaca has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles