The calculated distance (air line) between Nadd al Ḩumr and Lahbab is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Lahbab is certainly longer, as only the direct route (as the crow flies) between Nadd al Ḩumr and Lahbab has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles