The calculated distance (air line) between Richterswil and Zürich (Kreis 3) is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Zürich (Kreis 3) is certainly longer, as only the direct route (as the crow flies) between Richterswil and Zürich (Kreis 3) has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles