The calculated distance (air line) between Kota Bharu and Bukit Mertajam is approximately 133 miles respectively 214 kilometers.
By car or train, the actual journey to Bukit Mertajam is certainly longer, as only the direct route (as the crow flies) between Kota Bharu and Bukit Mertajam has been calculated here.
Air line (approximately)
214 kilometers
115 nautical miles