The calculated distance (air line) between Ḩamāh and As Salamīyah is approximately 19 miles respectively 30 kilometers.
By car or train, the actual journey to As Salamīyah is certainly longer, as only the direct route (as the crow flies) between Ḩamāh and As Salamīyah has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles