The calculated distance (air line) between Zürich (Kreis 7) / Hottingen and Rapperswil is approximately 16 miles respectively 25 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) / Hottingen and Rapperswil has been calculated here.
Air line (approximately)
25 kilometers
14 nautical miles