The calculated distance (air line) between Chŏngju and Ŭnch’ŏn-ŭp is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Ŭnch’ŏn-ŭp is certainly longer, as only the direct route (as the crow flies) between Chŏngju and Ŭnch’ŏn-ŭp has been calculated here.
Air line (approximately)
127 kilometers
68 nautical miles