The calculated distance (air line) between Tecámac and Ecatepec de Morelos is approximately 10 miles respectively 15 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 Tecámac and Ecatepec de Morelos has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles