The calculated distance (air line) between Zürich (Kreis 10) / Höngg and Uster is approximately 11 miles respectively 18 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 10) / Höngg and Uster has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles