The calculated distance (air line) between Hwaseong-si and Gwangmyeong is approximately 19 miles respectively 30 kilometers.
By car or train, the actual journey to Gwangmyeong is certainly longer, as only the direct route (as the crow flies) between Hwaseong-si and Gwangmyeong has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles