The calculated distance (air line) between Stadt Winterthur (Kreis 1) and Zürich is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Zürich is certainly longer, as only the direct route (as the crow flies) between Stadt Winterthur (Kreis 1) and Zürich has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles