The calculated distance (air line) between Frasnes-lez-Buissenal and Kortrijk is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Kortrijk is certainly longer, as only the direct route (as the crow flies) between Frasnes-lez-Buissenal and Kortrijk has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles