The calculated distance (air line) between Graaff-Reinet and Plettenberg Bay is approximately 141 miles respectively 227 kilometers.
By car or train, the actual journey to Plettenberg Bay is certainly longer, as only the direct route (as the crow flies) between Graaff-Reinet and Plettenberg Bay has been calculated here.
Air line (approximately)
227 kilometers
123 nautical miles