The calculated distance (air line) between Porrentruy and Zürich (Kreis 2) is approximately 68 miles respectively 109 kilometers.
By car or train, the actual journey to Zürich (Kreis 2) is certainly longer, as only the direct route (as the crow flies) between Porrentruy and Zürich (Kreis 2) has been calculated here.
Air line (approximately)
109 kilometers
59 nautical miles