The calculated distance (air line) between Mislīyah and Khamis Mushait is approximately 59 miles respectively 95 kilometers.
By car or train, the actual journey to Khamis Mushait is certainly longer, as only the direct route (as the crow flies) between Mislīyah and Khamis Mushait has been calculated here.
Air line (approximately)
95 kilometers
51 nautical miles