The calculated distance (air line) between Sīlat az̧ Z̧ahr and Qalqīlyah is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Qalqīlyah is certainly longer, as only the direct route (as the crow flies) between Sīlat az̧ Z̧ahr and Qalqīlyah has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles