The calculated distance (air line) between Zürich (Kreis 3) / Sihlfeld and Winterthur is approximately 13 miles respectively 22 kilometers.
By car or train, the actual journey to Winterthur is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 3) / Sihlfeld and Winterthur has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles