The calculated distance (air line) between Dayr al Ghuşūn and Janīn is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Janīn is certainly longer, as only the direct route (as the crow flies) between Dayr al Ghuşūn and Janīn has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles