The calculated distance (air line) between Mont-Saint-Guibert and Schaerbeek is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Schaerbeek is certainly longer, as only the direct route (as the crow flies) between Mont-Saint-Guibert and Schaerbeek has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles