The calculated distance (air line) between Grez-Doiceau and Etterbeek is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Etterbeek is certainly longer, as only the direct route (as the crow flies) between Grez-Doiceau and Etterbeek has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles