The calculated distance (air line) between Zürich (Kreis 4) / Hard and Uster is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Uster is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 4) / Hard and Uster has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles