The calculated distance (air line) between Khon Kaen and Nong Wua So is approximately 52 miles respectively 84 kilometers.
By car or train, the actual journey to Nong Wua So is certainly longer, as only the direct route (as the crow flies) between Khon Kaen and Nong Wua So has been calculated here.
Air line (approximately)
84 kilometers
45 nautical miles