The calculated distance (air line) between Şalākhid and As Salamīyah is approximately 150 miles respectively 242 kilometers.
By car or train, the actual journey to As Salamīyah is certainly longer, as only the direct route (as the crow flies) between Şalākhid and As Salamīyah has been calculated here.
Air line (approximately)
242 kilometers
131 nautical miles