The calculated distance (air line) between Saḩam al Kaffārāt and Rukban is approximately 175 miles respectively 282 kilometers.
By car or train, the actual journey to Rukban is certainly longer, as only the direct route (as the crow flies) between Saḩam al Kaffārāt and Rukban has been calculated here.
Air line (approximately)
282 kilometers
152 nautical miles