| Alcacer do Sal to Oberkirch | 1,084.82 mi (1,745.85 km) |
| Alcacer do Sal to Obernburg am Main | 1,175.69 mi (1,892.09 km) |
| Alcacer do Sal to Obernkirchen | 1,279.72 mi (2,059.52 km) |
| Alcacer do Sal to Oberschleissheim | 1,212.74 mi (1,951.71 km) |
| Alcacer do Sal to Oberstdorf | 1,133.30 mi (1,823.87 km) |
| Alcacer do Sal to Obertraubling | 1,259.78 mi (2,027.42 km) |
| Alcacer do Sal to Obertshausen | 1,173.91 mi (1,889.23 km) |
| Alcacer do Sal to Oberursel | 1,170.60 mi (1,883.90 km) |
| Alcacer do Sal to Ochsenfurt | 1,202.30 mi (1,934.92 km) |
| Alcacer do Sal to Ochsenhausen | 1,141.09 mi (1,836.41 km) |
| Alcacer do Sal to Ochtrup | 1,217.72 mi (1,959.73 km) |
| Alcacer do Sal to Odenthal | 1,158.94 mi (1,865.14 km) |
| Alcacer do Sal to Oelde | 1,229.15 mi (1,978.13 km) |
| Alcacer do Sal to Oelsnitz | 1,309.37 mi (2,107.23 km) |
| Alcacer do Sal to Oer-Erkenschwick | 1,192.11 mi (1,918.52 km) |
