The calculated distance (air line) between Nîmes and La Seyne-sur-Mer is approximately 92 miles respectively 147 kilometers.
By car or train, the actual journey to La Seyne-sur-Mer is certainly longer, as only the direct route (as the crow flies) between Nîmes and La Seyne-sur-Mer has been calculated here.
Air line (approximately)
147 kilometers
79 nautical miles