The calculated distance (air line) between Donji Vakuf and Mrkonjić Grad is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Mrkonjić Grad is certainly longer, as only the direct route (as the crow flies) between Donji Vakuf and Mrkonjić Grad has been calculated here.
Air line (approximately)
40 kilometers
21 nautical miles