| Estoril to Opwijk | 1,073.74 mi (1,728.02 km) |
| Estoril to Ostend | 1,051.01 mi (1,691.44 km) |
| Estoril to Oud-Heverlee | 1,081.71 mi (1,740.84 km) |
| Estoril to Oud-Turnhout | 1,115.18 mi (1,794.71 km) |
| Estoril to Oudenaarde | 1,050.61 mi (1,690.79 km) |
| Estoril to Oudenburg | 1,050.97 mi (1,691.37 km) |
| Estoril to Oupeye | 1,106.36 mi (1,780.52 km) |
| Estoril to Overijse | 1,075.16 mi (1,730.30 km) |
| Estoril to Overpelt | 1,123.49 mi (1,808.08 km) |
| Estoril to Paal | 1,107.35 mi (1,782.10 km) |
| Estoril to Peer | 1,120.57 mi (1,803.39 km) |
| Estoril to Pepinster | 1,105.39 mi (1,778.95 km) |
| Estoril to Peruwelz | 1,033.11 mi (1,662.63 km) |
| Estoril to Perwez | 1,076.09 mi (1,731.81 km) |
| Estoril to Philippeville | 1,047.29 mi (1,685.46 km) |
