| Tortona to Octeville | 590.56 mi (950.41 km) |
| Tortona to Oignies | 471.89 mi (759.43 km) |
| Tortona to Oissel | 477.11 mi (767.83 km) |
| Tortona to Olivet | 390.06 mi (627.74 km) |
| Tortona to Ollioules | 192.84 mi (310.35 km) |
| Tortona to Olonne-sur-Mer | 525.17 mi (845.18 km) |
| Tortona to Oloron-Sainte-Marie | 484.56 mi (779.83 km) |
| Tortona to Onet Village | 310.48 mi (499.66 km) |
| Tortona to Onnaing | 451.63 mi (726.83 km) |
| Tortona to Orange | 206.51 mi (332.35 km) |
| Tortona to Orchies | 465.57 mi (749.27 km) |
| Tortona to Orleans | 391.03 mi (629.30 km) |
| Tortona to Orly | 405.22 mi (652.14 km) |
| Tortona to Ormesson-sur-Marne | 401.90 mi (646.80 km) |
| Tortona to Orsay | 410.65 mi (660.88 km) |
