The calculated distance (air line) between Richterswil and Zürich (Kreis 11) is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Zürich (Kreis 11) is certainly longer, as only the direct route (as the crow flies) between Richterswil and Zürich (Kreis 11) has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles