The calculated distance (air line) between Thalwil / Dorfkern and Chur is approximately 55 miles respectively 88 kilometers.
By car or train, the actual journey to Chur is certainly longer, as only the direct route (as the crow flies) between Thalwil / Dorfkern and Chur has been calculated here.
Air line (approximately)
88 kilometers
48 nautical miles