The calculated distance (air line) between San Rafael Tlanalapan and Iztapalapa is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Iztapalapa is certainly longer, as only the direct route (as the crow flies) between San Rafael Tlanalapan and Iztapalapa has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles