The calculated distance (air line) between Široki Brijeg and Banja Luka is approximately 98 miles respectively 158 kilometers.
By car or train, the actual journey to Banja Luka is certainly longer, as only the direct route (as the crow flies) between Široki Brijeg and Banja Luka has been calculated here.
Air line (approximately)
158 kilometers
85 nautical miles