The calculated distance (air line) between An Nu‘mānīyah and Al Ḩayy is approximately 45 miles respectively 73 kilometers.
By car or train, the actual journey to Al Ḩayy is certainly longer, as only the direct route (as the crow flies) between An Nu‘mānīyah and Al Ḩayy has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles