The calculated distance (air line) between San Mateo Otzacatipan and Ecatepec de Morelos is approximately 40 miles respectively 64 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 Mateo Otzacatipan and Ecatepec de Morelos has been calculated here.
Air line (approximately)
64 kilometers
35 nautical miles