The calculated distance (air line) between Hoeryŏng and Sŭngjibaegam is approximately 96 miles respectively 155 kilometers.
By car or train, the actual journey to Sŭngjibaegam is certainly longer, as only the direct route (as the crow flies) between Hoeryŏng and Sŭngjibaegam has been calculated here.
Air line (approximately)
155 kilometers
83 nautical miles