The calculated distance (air line) between Ḩayy al Quwaysimah and As Salţ is approximately 16 miles respectively 25 kilometers.
By car or train, the actual journey to As Salţ is certainly longer, as only the direct route (as the crow flies) between Ḩayy al Quwaysimah and As Salţ has been calculated here.
Air line (approximately)
25 kilometers
14 nautical miles