The calculated distance (air line) between Fāqūs and Diyarb Najm is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Fāqūs and Diyarb Najm has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles