The calculated distance (air line) between Komusan Il-tong and Sŏnbong is approximately 39 miles respectively 62 kilometers.
By car or train, the actual journey to Sŏnbong is certainly longer, as only the direct route (as the crow flies) between Komusan Il-tong and Sŏnbong has been calculated here.
Air line (approximately)
62 kilometers
34 nautical miles