The calculated distance (air line) between Khon Kaen and Maha Sarakham is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Maha Sarakham is certainly longer, as only the direct route (as the crow flies) between Khon Kaen and Maha Sarakham has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles