The calculated distance (air line) between Saint-Josse-ten-Noode and Sint-Niklaas is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Sint-Niklaas is certainly longer, as only the direct route (as the crow flies) between Saint-Josse-ten-Noode and Sint-Niklaas has been calculated here.
Air line (approximately)
38 kilometers
21 nautical miles