The calculated distance (air line) between Saḩam al Kaffārāt and As Salţ is approximately 46 miles respectively 73 kilometers.
By car or train, the actual journey to As Salţ is certainly longer, as only the direct route (as the crow flies) between Saḩam al Kaffārāt and As Salţ has been calculated here.
Air line (approximately)
73 kilometers
40 nautical miles