The calculated distance (air line) between Yanji and Sŭngjibaegam is approximately 119 miles respectively 192 kilometers.
By car or train, the actual journey to Sŭngjibaegam is certainly longer, as only the direct route (as the crow flies) between Yanji and Sŭngjibaegam has been calculated here.
Air line (approximately)
192 kilometers
104 nautical miles