The calculated distance (air line) between Wichian Buri and Khon Kaen is approximately 127 miles respectively 204 kilometers.
By car or train, the actual journey to Khon Kaen is certainly longer, as only the direct route (as the crow flies) between Wichian Buri and Khon Kaen has been calculated here.
Air line (approximately)
204 kilometers
110 nautical miles