The calculated distance (air line) between Qaşr Bin Ghashīr and Msalātah is approximately 50 miles respectively 81 kilometers.
By car or train, the actual journey to Msalātah is certainly longer, as only the direct route (as the crow flies) between Qaşr Bin Ghashīr and Msalātah has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles