The calculated distance (air line) between Kokhav Ya‘aqov and Idhnā is approximately 27 miles respectively 44 kilometers.
By car or train, the actual journey to Idhnā is certainly longer, as only the direct route (as the crow flies) between Kokhav Ya‘aqov and Idhnā has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles