The calculated distance (air line) between Dayr Yūsuf and As Salţ is approximately 31 miles respectively 50 kilometers.
By car or train, the actual journey to As Salţ is certainly longer, as only the direct route (as the crow flies) between Dayr Yūsuf and As Salţ has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles