The calculated distance (air line) between Lumut and Bukit Mertajam is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Bukit Mertajam is certainly longer, as only the direct route (as the crow flies) between Lumut and Bukit Mertajam has been calculated here.
Air line (approximately)
127 kilometers
69 nautical miles