The calculated distance (air line) between Burj Islām and As Salamīyah is approximately 84 miles respectively 135 kilometers.
By car or train, the actual journey to As Salamīyah is certainly longer, as only the direct route (as the crow flies) between Burj Islām and As Salamīyah has been calculated here.
Air line (approximately)
135 kilometers
73 nautical miles