| Oliveira de Frades to Oberkirch | 962.04 mi (1,548.25 km) |
| Oliveira de Frades to Obernburg am Main | 1,047.85 mi (1,686.36 km) |
| Oliveira de Frades to Obernkirchen | 1,140.81 mi (1,835.96 km) |
| Oliveira de Frades to Oberschleissheim | 1,099.46 mi (1,769.42 km) |
| Oliveira de Frades to Oberstdorf | 1,023.18 mi (1,646.66 km) |
| Oliveira de Frades to Obertraubling | 1,143.16 mi (1,839.73 km) |
| Oliveira de Frades to Obertshausen | 1,044.19 mi (1,680.47 km) |
| Oliveira de Frades to Oberursel | 1,039.61 mi (1,673.09 km) |
| Oliveira de Frades to Ochsenfurt | 1,077.52 mi (1,734.10 km) |
| Oliveira de Frades to Ochsenhausen | 1,025.68 mi (1,650.67 km) |
| Oliveira de Frades to Ochtrup | 1,075.20 mi (1,730.37 km) |
| Oliveira de Frades to Odenthal | 1,020.78 mi (1,642.78 km) |
| Oliveira de Frades to Oelde | 1,089.98 mi (1,754.16 km) |
| Oliveira de Frades to Oelsnitz | 1,184.63 mi (1,906.48 km) |
| Oliveira de Frades to Oer-Erkenschwick | 1,051.79 mi (1,692.70 km) |
