| Estoril to Octeville | 845.85 mi (1,361.26 km) |
| Estoril to Oignies | 1,013.29 mi (1,630.74 km) |
| Estoril to Oissel | 899.15 mi (1,447.05 km) |
| Estoril to Olivet | 848.81 mi (1,366.03 km) |
| Estoril to Ollioules | 851.32 mi (1,370.06 km) |
| Estoril to Olonne-sur-Mer | 664.99 mi (1,070.19 km) |
| Estoril to Oloron-Sainte-Marie | 553.36 mi (890.54 km) |
| Estoril to Onet Village | 732.13 mi (1,178.25 km) |
| Estoril to Onnaing | 1,027.04 mi (1,652.85 km) |
| Estoril to Orange | 824.79 mi (1,327.37 km) |
| Estoril to Orchies | 1,020.91 mi (1,643.00 km) |
| Estoril to Orleans | 850.95 mi (1,369.47 km) |
| Estoril to Orly | 907.69 mi (1,460.79 km) |
| Estoril to Ormesson-sur-Marne | 914.41 mi (1,471.60 km) |
| Estoril to Orsay | 898.89 mi (1,446.62 km) |
