| Estoril to Nuth | 1,123.84 mi (1,808.65 km) |
| Estoril to Oegstgeest | 1,144.30 mi (1,841.57 km) |
| Estoril to Oirschot | 1,133.78 mi (1,824.64 km) |
| Estoril to Oisterwijk | 1,134.90 mi (1,826.44 km) |
| Estoril to Oldebroek | 1,198.70 mi (1,929.11 km) |
| Estoril to Oldenzaal | 1,222.96 mi (1,968.16 km) |
| Estoril to Ommen | 1,217.15 mi (1,958.81 km) |
| Estoril to Oosterend | 1,231.33 mi (1,981.63 km) |
| Estoril to Oosterhout | 1,127.73 mi (1,814.91 km) |
| Estoril to Oosterwolde | 1,237.05 mi (1,990.84 km) |
| Estoril to Oostzaan | 1,168.89 mi (1,881.15 km) |
| Estoril to Opmeer | 1,184.60 mi (1,906.43 km) |
| Estoril to Oss | 1,153.44 mi (1,856.28 km) |
| Estoril to Oud-Beijerland | 1,123.41 mi (1,807.95 km) |
| Estoril to Oudenbosch | 1,115.29 mi (1,794.89 km) |
