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