The calculated distance (air line) between Zürich (Kreis 11) / Affoltern and Wil is approximately 25 miles respectively 40 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 11) / Affoltern and Wil has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles