The calculated distance (air line) between Puryŏng-ŭp and Sinp’o is approximately 160 miles respectively 258 kilometers.
By car or train, the actual journey to Sinp’o is certainly longer, as only the direct route (as the crow flies) between Puryŏng-ŭp and Sinp’o has been calculated here.
Air line (approximately)
258 kilometers
139 nautical miles