The calculated distance (air line) between Bosanska Krupa and Mrkonjić Grad is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Mrkonjić Grad is certainly longer, as only the direct route (as the crow flies) between Bosanska Krupa and Mrkonjić Grad has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles