The calculated distance (air line) between T’ongch’ŏn-ŭp and Kilju is approximately 158 miles respectively 255 kilometers.
By car or train, the actual journey to Kilju is certainly longer, as only the direct route (as the crow flies) between T’ongch’ŏn-ŭp and Kilju has been calculated here.
Air line (approximately)
255 kilometers
138 nautical miles