The calculated distance (air line) between Zürich (Kreis 6) / Unterstrass and Wil is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Wil is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 6) / Unterstrass and Wil has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles