The calculated distance (air line) between Zürich (Kreis 8) / Mühlebach and Rapperswil is approximately 15 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 8) / Mühlebach and Rapperswil has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles