The calculated distance (air line) between Cheongju-si and Hwaseong-si is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Hwaseong-si is certainly longer, as only the direct route (as the crow flies) between Cheongju-si and Hwaseong-si has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles