The calculated distance (air line) between T’aebaek and Cheongju-si is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to Cheongju-si is certainly longer, as only the direct route (as the crow flies) between T’aebaek and Cheongju-si has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles