The calculated distance (air line) between Oberwinterthur (Kreis 2) / Talacker and Zürich (Kreis 11) is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Zürich (Kreis 11) is certainly longer, as only the direct route (as the crow flies) between Oberwinterthur (Kreis 2) / Talacker and Zürich (Kreis 11) has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles