The calculated distance (air line) between Dayr al Ghuşūn and Nablus is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Nablus is certainly longer, as only the direct route (as the crow flies) between Dayr al Ghuşūn and Nablus has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles