The calculated distance (air line) between Cairo and Al Qāhirah al Jadīdah is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Al Qāhirah al Jadīdah is certainly longer, as only the direct route (as the crow flies) between Cairo and Al Qāhirah al Jadīdah has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles