The calculated distance (air line) between Primorsko-Akhtarsk and Krasnodar is approximately 79 miles respectively 128 kilometers.
By car or train, the actual journey to Krasnodar is certainly longer, as only the direct route (as the crow flies) between Primorsko-Akhtarsk and Krasnodar has been calculated here.
Air line (approximately)
128 kilometers
69 nautical miles