The calculated distance (air line) between Puryŏng and Sŭngjibaegam is approximately 74 miles respectively 118 kilometers.
By car or train, the actual journey to Sŭngjibaegam is certainly longer, as only the direct route (as the crow flies) between Puryŏng and Sŭngjibaegam has been calculated here.
Air line (approximately)
118 kilometers
64 nautical miles