The calculated distance (air line) between Zürich (Kreis 7) / Witikon and Rapperswil is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Rapperswil is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 7) / Witikon and Rapperswil has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles