The calculated distance (air line) between Ar Rumaythah and Al Ḩayy is approximately 66 miles respectively 107 kilometers.
By car or train, the actual journey to Al Ḩayy is certainly longer, as only the direct route (as the crow flies) between Ar Rumaythah and Al Ḩayy has been calculated here.
Air line (approximately)
107 kilometers
58 nautical miles