The calculated distance (air line) between Mechelen-aan-de-Maas and Uccle is approximately 60 miles respectively 97 kilometers.
By car or train, the actual journey to Uccle is certainly longer, as only the direct route (as the crow flies) between Mechelen-aan-de-Maas and Uccle has been calculated here.
Air line (approximately)
97 kilometers
52 nautical miles