| Sinaia to Octeville | 1,295.94 mi (2,085.62 km) |
| Sinaia to Oignies | 1,097.90 mi (1,766.89 km) |
| Sinaia to Oissel | 1,172.23 mi (1,886.52 km) |
| Sinaia to Olivet | 1,131.42 mi (1,820.84 km) |
| Sinaia to Ollioules | 984.63 mi (1,584.61 km) |
| Sinaia to Olonne-sur-Mer | 1,308.79 mi (2,106.30 km) |
| Sinaia to Oloron-Sainte-Marie | 1,296.88 mi (2,087.13 km) |
| Sinaia to Onet Village | 1,122.65 mi (1,806.74 km) |
| Sinaia to Onnaing | 1,070.71 mi (1,723.15 km) |
| Sinaia to Orange | 1,018.48 mi (1,639.09 km) |
| Sinaia to Orchies | 1,087.12 mi (1,749.55 km) |
| Sinaia to Orleans | 1,131.03 mi (1,820.22 km) |
| Sinaia to Orly | 1,110.63 mi (1,787.39 km) |
| Sinaia to Ormesson-sur-Marne | 1,104.20 mi (1,777.04 km) |
| Sinaia to Orsay | 1,119.79 mi (1,802.14 km) |
