The calculated distance (air line) between Cheongsong gun and Cheongju-si is approximately 88 miles respectively 142 kilometers.
By car or train, the actual journey to Cheongju-si is certainly longer, as only the direct route (as the crow flies) between Cheongsong gun and Cheongju-si has been calculated here.
Air line (approximately)
142 kilometers
77 nautical miles