The calculated distance (air line) between Uster / Ober-Uster and Wil is approximately 17 miles respectively 27 kilometers.
By car or train, the actual journey to Wil is certainly longer, as only the direct route (as the crow flies) between Uster / Ober-Uster and Wil has been calculated here.
Air line (approximately)
27 kilometers
14 nautical miles