The calculated distance (air line) between Winterthur and Zürich (Kreis 9) is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Zürich (Kreis 9) is certainly longer, as only the direct route (as the crow flies) between Winterthur and Zürich (Kreis 9) has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles