The calculated distance (air line) between Santo Tomás Chiconautla and Iztapalapa is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Iztapalapa is certainly longer, as only the direct route (as the crow flies) between Santo Tomás Chiconautla and Iztapalapa has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles