The calculated distance (air line) between Sŭngho 1-tong and Chŏngju is approximately 64 miles respectively 102 kilometers.
By car or train, the actual journey to Chŏngju is certainly longer, as only the direct route (as the crow flies) between Sŭngho 1-tong and Chŏngju has been calculated here.
Air line (approximately)
102 kilometers
55 nautical miles