The calculated distance (air line) between Zürich (Kreis 9) / Altstetten and Biel/Bienne is approximately 61 miles respectively 98 kilometers.
By car or train, the actual journey to Biel/Bienne is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 9) / Altstetten and Biel/Bienne has been calculated here.
Air line (approximately)
98 kilometers
53 nautical miles