The calculated distance (air line) between Cheongju-si and Chinch'ŏn is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Chinch'ŏn is certainly longer, as only the direct route (as the crow flies) between Cheongju-si and Chinch'ŏn has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles