The calculated distance (air line) between Shaykh Miskīn and As Salamīyah is approximately 159 miles respectively 257 kilometers.
By car or train, the actual journey to As Salamīyah is certainly longer, as only the direct route (as the crow flies) between Shaykh Miskīn and As Salamīyah has been calculated here.
Air line (approximately)
257 kilometers
138 nautical miles