The calculated distance (air line) between Wülflingen (Kreis 6) and Rapperswil is approximately 21 miles respectively 33 kilometers.
By car or train, the actual journey to Rapperswil is certainly longer, as only the direct route (as the crow flies) between Wülflingen (Kreis 6) and Rapperswil has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles