The calculated distance (air line) between Ar Riyāḑ and Al Qāhirah al Jadīdah is approximately 88 miles respectively 142 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 Ar Riyāḑ and Al Qāhirah al Jadīdah has been calculated here.
Air line (approximately)
142 kilometers
76 nautical miles