The calculated distance (air line) between Sint-Lenaarts and Sint-Niklaas is approximately 26 miles respectively 43 kilometers.
By car or train, the actual journey to Sint-Niklaas is certainly longer, as only the direct route (as the crow flies) between Sint-Lenaarts and Sint-Niklaas has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles