The calculated distance (air line) between Mechelen-aan-de-Maas and Aalst is approximately 72 miles respectively 116 kilometers.
By car or train, the actual journey to Aalst is certainly longer, as only the direct route (as the crow flies) between Mechelen-aan-de-Maas and Aalst has been calculated here.
Air line (approximately)
116 kilometers
63 nautical miles