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