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