| Louisville to Orbetello | 4,812.65 mi (7,745.22 km) |
| Louisville to Oria | 5,160.85 mi (8,305.59 km) |
| Louisville to Oristano | 4,795.09 mi (7,716.96 km) |
| Louisville to Orta Nova | 5,046.15 mi (8,120.99 km) |
| Louisville to Orte | 4,861.48 mi (7,823.80 km) |
| Louisville to Ortona | 4,950.20 mi (7,966.58 km) |
| Louisville to Orvieto | 4,839.87 mi (7,789.01 km) |
| Louisville to Orzinuovi | 4,648.30 mi (7,480.71 km) |
| Louisville to Osimo | 4,867.33 mi (7,833.21 km) |
| Louisville to Ospitaletto | 4,648.37 mi (7,480.83 km) |
| Louisville to Ostuni | 5,148.97 mi (8,286.46 km) |
| Louisville to Ottaviano | 5,013.74 mi (8,068.83 km) |
| Louisville to Ovada | 4,622.51 mi (7,439.21 km) |
| Louisville to Ozieri | 4,787.65 mi (7,704.99 km) |
| Louisville to Paceco | 5,045.62 mi (8,120.15 km) |
