The calculated distance (air line) between Thalwil and Zürich (Kreis 12) is approximately 8 miles respectively 12 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Thalwil and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
12 kilometers
7 nautical miles