The calculated distance (air line) between Khon Kaen and Kaeng Khro is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Kaeng Khro is certainly longer, as only the direct route (as the crow flies) between Khon Kaen and Kaeng Khro has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles