The calculated distance (air line) between Chaeryŏng-ŭp and Chŏngju is approximately 92 miles respectively 148 kilometers.
By car or train, the actual journey to Chŏngju is certainly longer, as only the direct route (as the crow flies) between Chaeryŏng-ŭp and Chŏngju has been calculated here.
Air line (approximately)
148 kilometers
80 nautical miles