The calculated distance (air line) between Leighton Buzzard and Kempston Hardwick is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Kempston Hardwick is certainly longer, as only the direct route (as the crow flies) between Leighton Buzzard and Kempston Hardwick has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles