The calculated distance (air line) between Saint-Priest-en-Jarez and Besançon is approximately 145 miles respectively 234 kilometers.
By car or train, the actual journey to Besançon is certainly longer, as only the direct route (as the crow flies) between Saint-Priest-en-Jarez and Besançon has been calculated here.
Air line (approximately)
234 kilometers
126 nautical miles