The calculated distance (air line) between Zürich (Kreis 3) / Alt-Wiedikon and Dietikon is approximately 6 miles respectively 10 kilometers.
By car or train, the actual journey to Dietikon is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 3) / Alt-Wiedikon and Dietikon has been calculated here.
Air line (approximately)
10 kilometers
5 nautical miles