| Castelnaudary to Oria | 828.04 mi (1,332.61 km) |
| Castelnaudary to Oristano | 415.92 mi (669.35 km) |
| Castelnaudary to Orta Nova | 715.20 mi (1,151.00 km) |
| Castelnaudary to Orte | 531.07 mi (854.67 km) |
| Castelnaudary to Ortona | 633.56 mi (1,019.61 km) |
| Castelnaudary to Orvieto | 514.42 mi (827.88 km) |
| Castelnaudary to Orzinuovi | 419.38 mi (674.93 km) |
| Castelnaudary to Osimo | 578.44 mi (930.90 km) |
| Castelnaudary to Ospitaletto | 429.11 mi (690.59 km) |
| Castelnaudary to Ostuni | 820.51 mi (1,320.48 km) |
| Castelnaudary to Ottaviano | 663.72 mi (1,068.16 km) |
| Castelnaudary to Ovada | 344.93 mi (555.10 km) |
| Castelnaudary to Ozieri | 408.31 mi (657.11 km) |
| Castelnaudary to Paceco | 665.81 mi (1,071.52 km) |
| Castelnaudary to Pachino | 830.29 mi (1,336.23 km) |
