The calculated distance (air line) between Estavayer-le-Lac and Rapperswil is approximately 97 miles respectively 155 kilometers.
By car or train, the actual journey to Rapperswil is certainly longer, as only the direct route (as the crow flies) between Estavayer-le-Lac and Rapperswil has been calculated here.
Air line (approximately)
155 kilometers
84 nautical miles