The calculated distance (air line) between Thalwil / Dorfkern and Genève is approximately 137 miles respectively 221 kilometers.
By car or train, the actual journey to Genève is certainly longer, as only the direct route (as the crow flies) between Thalwil / Dorfkern and Genève has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles