The calculated distance (air line) between Yŏnggwang-ŭp and Chasŏng is approximately 108 miles respectively 174 kilometers.
By car or train, the actual journey to Chasŏng is certainly longer, as only the direct route (as the crow flies) between Yŏnggwang-ŭp and Chasŏng has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles