The calculated distance (air line) between Frasnes-lez-Buissenal and Etterbeek is approximately 35 miles respectively 57 kilometers.
By car or train, the actual journey to Etterbeek is certainly longer, as only the direct route (as the crow flies) between Frasnes-lez-Buissenal and Etterbeek has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles