The calculated distance (air line) between Az Zarqā and Diyarb Najm is approximately 33 miles respectively 54 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Az Zarqā and Diyarb Najm has been calculated here.
Air line (approximately)
54 kilometers
29 nautical miles