The calculated distance (air line) between Sīlat al Ḩārithīyah and As Samū‘ is approximately 77 miles respectively 125 kilometers.
By car or train, the actual journey to As Samū‘ is certainly longer, as only the direct route (as the crow flies) between Sīlat al Ḩārithīyah and As Samū‘ has been calculated here.
Air line (approximately)
125 kilometers
67 nautical miles