The calculated distance (air line) between New Cairo and Al Ḩawāmidīyah is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Al Ḩawāmidīyah is certainly longer, as only the direct route (as the crow flies) between New Cairo and Al Ḩawāmidīyah has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles