The calculated distance (air line) between Melchor Ocampo and Iztapalapa is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Iztapalapa is certainly longer, as only the direct route (as the crow flies) between Melchor Ocampo and Iztapalapa has been calculated here.
Air line (approximately)
40 kilometers
21 nautical miles