The calculated distance (air line) between Frasnes-lez-Buissenal and Jette is approximately 34 miles respectively 55 kilometers.
By car or train, the actual journey to Jette is certainly longer, as only the direct route (as the crow flies) between Frasnes-lez-Buissenal and Jette has been calculated here.
Air line (approximately)
55 kilometers
30 nautical miles