The calculated distance (air line) between Yŏnggwang-ŭp and Chŏngju is approximately 121 miles respectively 195 kilometers.
By car or train, the actual journey to Chŏngju is certainly longer, as only the direct route (as the crow flies) between Yŏnggwang-ŭp and Chŏngju has been calculated here.
Air line (approximately)
195 kilometers
105 nautical miles