The calculated distance (air line) between Ch’ŏngdan-ŭp and P’yŏngsŏng is approximately 88 miles respectively 142 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Ch’ŏngdan-ŭp and P’yŏngsŏng has been calculated here.
Air line (approximately)
142 kilometers
77 nautical miles