The calculated distance (air line) between Flawil and Zürich (Kreis 11) is approximately 31 miles respectively 50 kilometers.
By car or train, the actual journey to Zürich (Kreis 11) is certainly longer, as only the direct route (as the crow flies) between Flawil and Zürich (Kreis 11) has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles