The calculated distance (air line) between Winterthur and Zürich (Kreis 10) is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Zürich (Kreis 10) is certainly longer, as only the direct route (as the crow flies) between Winterthur and Zürich (Kreis 10) has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles