The calculated distance (air line) between Si Bun Rueang and Khon Kaen is approximately 51 miles respectively 83 kilometers.
By car or train, the actual journey to Khon Kaen is certainly longer, as only the direct route (as the crow flies) between Si Bun Rueang and Khon Kaen has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles