The calculated distance (air line) between Oud-Heverlee and Schaerbeek is approximately 13 miles respectively 20 kilometers.
By car or train, the actual journey to Schaerbeek is certainly longer, as only the direct route (as the crow flies) between Oud-Heverlee and Schaerbeek has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles