The calculated distance (air line) between Pfäffikon / Pfäffikon (Dorfkern) and Biel/Bienne is approximately 74 miles respectively 119 kilometers.
By car or train, the actual journey to Biel/Bienne is certainly longer, as only the direct route (as the crow flies) between Pfäffikon / Pfäffikon (Dorfkern) and Biel/Bienne has been calculated here.
Air line (approximately)
119 kilometers
64 nautical miles