The calculated distance (air line) between Hamhŭng and P’yŏngsŏng is approximately 100 miles respectively 161 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Hamhŭng and P’yŏngsŏng has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles