The calculated distance (air line) between Iztapalapa and Ojo de Agua is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Ojo de Agua is certainly longer, as only the direct route (as the crow flies) between Iztapalapa and Ojo de Agua has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles