The calculated distance (air line) between Oud-Heverlee and Etterbeek is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Etterbeek is certainly longer, as only the direct route (as the crow flies) between Oud-Heverlee and Etterbeek has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles