The calculated distance (air line) between Az̧ Z̧a‘āyin and An Najmah is approximately 22 miles respectively 35 kilometers.
By car or train, the actual journey to An Najmah is certainly longer, as only the direct route (as the crow flies) between Az̧ Z̧a‘āyin and An Najmah has been calculated here.
Air line (approximately)
35 kilometers
19 nautical miles