The calculated distance (air line) between Sangsŏng-ni and P’yŏngsŏng is approximately 55 miles respectively 88 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Sangsŏng-ni and P’yŏngsŏng has been calculated here.
Air line (approximately)
88 kilometers
47 nautical miles