The calculated distance (air line) between Gwangmyeong and Sariwŏn is approximately 93 miles respectively 150 kilometers.
By car or train, the actual journey to Sariwŏn is certainly longer, as only the direct route (as the crow flies) between Gwangmyeong and Sariwŏn has been calculated here.
Air line (approximately)
150 kilometers
81 nautical miles