The calculated distance (air line) between Pyongyang and P’yŏngsŏng is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Pyongyang and P’yŏngsŏng has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles