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