The calculated distance (air line) between Sŏnbong and Sŭngjibaegam is approximately 112 miles respectively 180 kilometers.
By car or train, the actual journey to Sŭngjibaegam is certainly longer, as only the direct route (as the crow flies) between Sŏnbong and Sŭngjibaegam has been calculated here.
Air line (approximately)
180 kilometers
97 nautical miles