The calculated distance (air line) between Sète and Aix-en-Provence is approximately 89 miles respectively 142 kilometers.
By car or train, the actual journey to Aix-en-Provence is certainly longer, as only the direct route (as the crow flies) between Sète and Aix-en-Provence has been calculated here.
Air line (approximately)
142 kilometers
77 nautical miles