The calculated distance (air line) between San Marcos de León and Ecatepec de Morelos is approximately 137 miles respectively 221 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 Marcos de León and Ecatepec de Morelos has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles