The calculated distance (air line) between Željezno Polje and Mrkonjić Grad is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to Mrkonjić Grad is certainly longer, as only the direct route (as the crow flies) between Željezno Polje and Mrkonjić Grad has been calculated here.
Air line (approximately)
68 kilometers
37 nautical miles