The calculated distance (air line) between Hwaseong-si and Hwawŏn is approximately 135 miles respectively 217 kilometers.
By car or train, the actual journey to Hwawŏn is certainly longer, as only the direct route (as the crow flies) between Hwaseong-si and Hwawŏn has been calculated here.
Air line (approximately)
217 kilometers
117 nautical miles