The calculated distance (air line) between Sŭngjibaegam and Kyŏngwŏn is approximately 129 miles respectively 208 kilometers.
By car or train, the actual journey to Kyŏngwŏn is certainly longer, as only the direct route (as the crow flies) between Sŭngjibaegam and Kyŏngwŏn has been calculated here.
Air line (approximately)
208 kilometers
112 nautical miles