The calculated distance (air line) between Nong Bua Lamphu and Khon Kaen is approximately 58 miles respectively 94 kilometers.
By car or train, the actual journey to Khon Kaen is certainly longer, as only the direct route (as the crow flies) between Nong Bua Lamphu and Khon Kaen has been calculated here.
Air line (approximately)
94 kilometers
51 nautical miles