The calculated distance (air line) between Oakham and Melton Mowbray is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Melton Mowbray is certainly longer, as only the direct route (as the crow flies) between Oakham and Melton Mowbray has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles