| Sierre to Octeville | 482.32 mi (776.21 km) |
| Sierre to Oignies | 355.34 mi (571.87 km) |
| Sierre to Oissel | 365.16 mi (587.66 km) |
| Sierre to Olivet | 286.11 mi (460.45 km) |
| Sierre to Ollioules | 233.53 mi (375.83 km) |
| Sierre to Olonne-sur-Mer | 443.31 mi (713.45 km) |
| Sierre to Oloron-Sainte-Marie | 453.12 mi (729.22 km) |
| Sierre to Onet Village | 274.57 mi (441.88 km) |
| Sierre to Onnaing | 335.20 mi (539.45 km) |
| Sierre to Orange | 199.67 mi (321.34 km) |
| Sierre to Orchies | 349.05 mi (561.75 km) |
| Sierre to Orleans | 286.67 mi (461.35 km) |
| Sierre to Orly | 293.22 mi (471.90 km) |
| Sierre to Ormesson-sur-Marne | 289.34 mi (465.64 km) |
| Sierre to Orsay | 299.43 mi (481.89 km) |
