The calculated distance (air line) between Široki Brijeg and Mrkonjić Grad is approximately 76 miles respectively 122 kilometers.
By car or train, the actual journey to Mrkonjić Grad is certainly longer, as only the direct route (as the crow flies) between Široki Brijeg and Mrkonjić Grad has been calculated here.
Air line (approximately)
122 kilometers
66 nautical miles