The calculated distance (air line) between Zürich (Kreis 9) and Dübendorf is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Dübendorf is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 9) and Dübendorf has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles