The calculated distance (air line) between ‘Afrīn and As Salamīyah is approximately 104 miles respectively 168 kilometers.
By car or train, the actual journey to As Salamīyah is certainly longer, as only the direct route (as the crow flies) between ‘Afrīn and As Salamīyah has been calculated here.
Air line (approximately)
168 kilometers
90 nautical miles