| Rennes to Oria | 1,085.91 mi (1,747.61 km) |
| Rennes to Oristano | 761.69 mi (1,225.82 km) |
| Rennes to Orta Nova | 970.80 mi (1,562.35 km) |
| Rennes to Orte | 785.74 mi (1,264.53 km) |
| Rennes to Ortona | 875.59 mi (1,409.12 km) |
| Rennes to Orvieto | 764.11 mi (1,229.72 km) |
| Rennes to Orzinuovi | 580.12 mi (933.62 km) |
| Rennes to Osimo | 795.65 mi (1,280.47 km) |
| Rennes to Ospitaletto | 582.29 mi (937.11 km) |
| Rennes to Ostuni | 1,074.50 mi (1,729.24 km) |
| Rennes to Ottaviano | 938.58 mi (1,510.49 km) |
| Rennes to Ovada | 547.06 mi (880.41 km) |
| Rennes to Ozieri | 739.80 mi (1,190.59 km) |
| Rennes to Paceco | 1,000.04 mi (1,609.42 km) |
| Rennes to Pachino | 1,158.41 mi (1,864.27 km) |
