The calculated distance (air line) between Unión y Progreso and Iztapalapa is approximately 131 miles respectively 211 kilometers.
By car or train, the actual journey to Iztapalapa is certainly longer, as only the direct route (as the crow flies) between Unión y Progreso and Iztapalapa has been calculated here.
Air line (approximately)
211 kilometers
114 nautical miles