The calculated distance (air line) between Subang Jaya and Bukit Mertajam is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to Bukit Mertajam is certainly longer, as only the direct route (as the crow flies) between Subang Jaya and Bukit Mertajam has been calculated here.
Air line (approximately)
286 kilometers
154 nautical miles