The calculated distance (air line) between Permatang Kuching and Alor Setar is approximately 45 miles respectively 73 kilometers.
By car or train, the actual journey to Alor Setar is certainly longer, as only the direct route (as the crow flies) between Permatang Kuching and Alor Setar has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles