The calculated distance (air line) between Batu Feringgi and Bukit Mertajam is approximately 17 miles respectively 27 kilometers.
By car or train, the actual journey to Bukit Mertajam is certainly longer, as only the direct route (as the crow flies) between Batu Feringgi and Bukit Mertajam has been calculated here.
Air line (approximately)
27 kilometers
15 nautical miles