The calculated distance (air line) between Herk-de-Stad and Etterbeek is approximately 35 miles respectively 56 kilometers.
By car or train, the actual journey to Etterbeek is certainly longer, as only the direct route (as the crow flies) between Herk-de-Stad and Etterbeek has been calculated here.
Air line (approximately)
56 kilometers
30 nautical miles