The calculated distance (air line) between Bayt Ḩānūn and Janīn is approximately 78 miles respectively 126 kilometers.
By car or train, the actual journey to Janīn is certainly longer, as only the direct route (as the crow flies) between Bayt Ḩānūn and Janīn has been calculated here.
Air line (approximately)
126 kilometers
68 nautical miles