The calculated distance (air line) between Al Ḩirāk and As Salamīyah is approximately 162 miles respectively 261 kilometers.
By car or train, the actual journey to As Salamīyah is certainly longer, as only the direct route (as the crow flies) between Al Ḩirāk and As Salamīyah has been calculated here.
Air line (approximately)
261 kilometers
141 nautical miles