The calculated distance (air line) between Pematangsiantar and Sabak Bernam is approximately 144 miles respectively 231 kilometers.
By car or train, the actual journey to Sabak Bernam is certainly longer, as only the direct route (as the crow flies) between Pematangsiantar and Sabak Bernam has been calculated here.
Air line (approximately)
231 kilometers
125 nautical miles