| Portimao to Oberkirch | 1,148.29 mi (1,848.00 km) |
| Portimao to Obernburg am Main | 1,241.33 mi (1,997.73 km) |
| Portimao to Obernkirchen | 1,350.69 mi (2,173.73 km) |
| Portimao to Oberschleissheim | 1,271.00 mi (2,045.47 km) |
| Portimao to Oberstdorf | 1,190.34 mi (1,915.66 km) |
| Portimao to Obertraubling | 1,319.54 mi (2,123.59 km) |
| Portimao to Obertshausen | 1,240.50 mi (1,996.38 km) |
| Portimao to Oberursel | 1,237.83 mi (1,992.10 km) |
| Portimao to Ochsenfurt | 1,266.33 mi (2,037.96 km) |
| Portimao to Ochsenhausen | 1,200.70 mi (1,932.34 km) |
| Portimao to Ochtrup | 1,290.66 mi (2,077.12 km) |
| Portimao to Odenthal | 1,229.80 mi (1,979.17 km) |
| Portimao to Oelde | 1,300.36 mi (2,092.73 km) |
| Portimao to Oelsnitz | 1,373.05 mi (2,209.72 km) |
| Portimao to Oer-Erkenschwick | 1,263.99 mi (2,034.19 km) |
