The calculated distance (air line) between Taphan Hin and Khon Kaen is approximately 161 miles respectively 259 kilometers.
By car or train, the actual journey to Khon Kaen is certainly longer, as only the direct route (as the crow flies) between Taphan Hin and Khon Kaen has been calculated here.
Air line (approximately)
259 kilometers
140 nautical miles