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