The calculated distance (air line) between Zürich (Kreis 12) / Schwamendingen-Mitte and Winterthur is approximately 10 miles respectively 16 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 12) / Schwamendingen-Mitte and Winterthur has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles