| Estoril to Navodari | 1,986.06 mi (3,196.25 km) |
| Estoril to Negresti-Oas | 1,751.99 mi (2,819.55 km) |
| Estoril to Nehoiu | 1,872.52 mi (3,013.54 km) |
| Estoril to Ocna Mures | 1,759.43 mi (2,831.52 km) |
| Estoril to Odobesti | 1,910.13 mi (3,074.06 km) |
| Estoril to Odorheiu Secuiesc | 1,827.50 mi (2,941.07 km) |
| Estoril to Oltenita | 1,888.68 mi (3,039.53 km) |
| Estoril to Onesti | 1,897.20 mi (3,053.26 km) |
| Estoril to Oradea | 1,674.13 mi (2,694.26 km) |
| Estoril to Orastie | 1,724.56 mi (2,775.41 km) |
| Estoril to Oravita | 1,646.82 mi (2,650.30 km) |
| Estoril to Orsova | 1,680.11 mi (2,703.88 km) |
| Estoril to Otelu Rosu | 1,681.85 mi (2,706.68 km) |
| Estoril to Otopeni | 1,860.32 mi (2,993.90 km) |
| Estoril to Ovidiu | 1,983.56 mi (3,192.23 km) |
