| Sintra to Octeville | 839.65 mi (1,351.29 km) |
| Sintra to Oignies | 1,007.48 mi (1,621.38 km) |
| Sintra to Oissel | 893.29 mi (1,437.62 km) |
| Sintra to Olivet | 843.33 mi (1,357.20 km) |
| Sintra to Ollioules | 847.98 mi (1,364.69 km) |
| Sintra to Olonne-sur-Mer | 659.20 mi (1,060.88 km) |
| Sintra to Oloron-Sainte-Marie | 549.01 mi (883.55 km) |
| Sintra to Onet Village | 727.84 mi (1,171.35 km) |
| Sintra to Onnaing | 1,021.30 mi (1,643.62 km) |
| Sintra to Orange | 820.91 mi (1,321.12 km) |
| Sintra to Orchies | 1,015.12 mi (1,633.68 km) |
| Sintra to Orleans | 845.46 mi (1,360.63 km) |
| Sintra to Orly | 902.09 mi (1,451.78 km) |
| Sintra to Ormesson-sur-Marne | 908.82 mi (1,462.61 km) |
| Sintra to Orsay | 893.27 mi (1,437.58 km) |
