The calculated distance (air line) between Zürich (Kreis 7) / Fluntern and Wil is approximately 23 miles respectively 38 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 7) / Fluntern and Wil has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles