The calculated distance (air line) between Hollogne-aux-Pierres and Etterbeek is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Etterbeek is certainly longer, as only the direct route (as the crow flies) between Hollogne-aux-Pierres and Etterbeek has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles