The calculated distance (air line) between Nidau and Zürich (Kreis 6) is approximately 64 miles respectively 103 kilometers.
By car or train, the actual journey to Zürich (Kreis 6) is certainly longer, as only the direct route (as the crow flies) between Nidau and Zürich (Kreis 6) has been calculated here.
Air line (approximately)
103 kilometers
55 nautical miles