The calculated distance (air line) between Souppes-sur-Loing and Besançon is approximately 166 miles respectively 267 kilometers.
By car or train, the actual journey to Besançon is certainly longer, as only the direct route (as the crow flies) between Souppes-sur-Loing and Besançon has been calculated here.
Air line (approximately)
267 kilometers
144 nautical miles