| Cascais to Opwijk | 1,074.53 mi (1,729.29 km) |
| Cascais to Ostend | 1,051.77 mi (1,692.66 km) |
| Cascais to Oud-Heverlee | 1,082.51 mi (1,742.13 km) |
| Cascais to Oud-Turnhout | 1,115.97 mi (1,795.99 km) |
| Cascais to Oudenaarde | 1,051.39 mi (1,692.04 km) |
| Cascais to Oudenburg | 1,051.73 mi (1,692.59 km) |
| Cascais to Oupeye | 1,107.19 mi (1,781.85 km) |
| Cascais to Overijse | 1,075.96 mi (1,731.59 km) |
| Cascais to Overpelt | 1,124.29 mi (1,809.38 km) |
| Cascais to Paal | 1,108.15 mi (1,783.40 km) |
| Cascais to Peer | 1,121.38 mi (1,804.69 km) |
| Cascais to Pepinster | 1,106.22 mi (1,780.29 km) |
| Cascais to Peruwelz | 1,033.90 mi (1,663.90 km) |
| Cascais to Perwez | 1,076.91 mi (1,733.11 km) |
| Cascais to Philippeville | 1,048.11 mi (1,686.78 km) |
