The calculated distance (air line) between Kokhav Ya‘aqov and Qalqīlyah is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Qalqīlyah is certainly longer, as only the direct route (as the crow flies) between Kokhav Ya‘aqov and Qalqīlyah has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles