| Boulogne-Billancourt to Oria | 947.67 mi (1,525.13 km) |
| Boulogne-Billancourt to Oristano | 691.52 mi (1,112.90 km) |
| Boulogne-Billancourt to Orta Nova | 835.00 mi (1,343.81 km) |
| Boulogne-Billancourt to Orte | 657.86 mi (1,058.73 km) |
| Boulogne-Billancourt to Ortona | 737.69 mi (1,187.20 km) |
| Boulogne-Billancourt to Orvieto | 635.32 mi (1,022.45 km) |
| Boulogne-Billancourt to Orzinuovi | 432.28 mi (695.69 km) |
| Boulogne-Billancourt to Osimo | 651.80 mi (1,048.97 km) |
| Boulogne-Billancourt to Ospitaletto | 431.62 mi (694.63 km) |
| Boulogne-Billancourt to Ostuni | 934.90 mi (1,504.58 km) |
| Boulogne-Billancourt to Ottaviano | 812.88 mi (1,308.21 km) |
| Boulogne-Billancourt to Ovada | 419.31 mi (674.82 km) |
| Boulogne-Billancourt to Ozieri | 659.08 mi (1,060.69 km) |
| Boulogne-Billancourt to Paceco | 909.20 mi (1,463.22 km) |
| Boulogne-Billancourt to Pachino | 1,058.25 mi (1,703.09 km) |
