The calculated distance (air line) between Thalwil / Dorfkern and Köniz is approximately 60 miles respectively 96 kilometers.
By car or train, the actual journey to Köniz is certainly longer, as only the direct route (as the crow flies) between Thalwil / Dorfkern and Köniz has been calculated here.
Air line (approximately)
96 kilometers
52 nautical miles