The calculated distance (air line) between Al Qaryatayn and As Salamīyah is approximately 55 miles respectively 89 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 Qaryatayn and As Salamīyah has been calculated here.
Air line (approximately)
89 kilometers
48 nautical miles