The calculated distance (air line) between Castle Donington and Kirby Muxloe is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Kirby Muxloe is certainly longer, as only the direct route (as the crow flies) between Castle Donington and Kirby Muxloe has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles