| Idanha-a-Nova to Oberkirch | 961.10 mi (1,546.75 km) |
| Idanha-a-Nova to Obernburg am Main | 1,050.83 mi (1,691.15 km) |
| Idanha-a-Nova to Obernkirchen | 1,153.12 mi (1,855.77 km) |
| Idanha-a-Nova to Oberschleissheim | 1,092.01 mi (1,757.43 km) |
| Idanha-a-Nova to Oberstdorf | 1,013.55 mi (1,631.16 km) |
| Idanha-a-Nova to Obertraubling | 1,138.02 mi (1,831.47 km) |
| Idanha-a-Nova to Obertshausen | 1,048.65 mi (1,687.64 km) |
| Idanha-a-Nova to Oberursel | 1,045.09 mi (1,681.91 km) |
| Idanha-a-Nova to Ochsenfurt | 1,078.18 mi (1,735.17 km) |
| Idanha-a-Nova to Ochsenhausen | 1,019.58 mi (1,640.86 km) |
| Idanha-a-Nova to Ochtrup | 1,090.89 mi (1,755.62 km) |
| Idanha-a-Nova to Odenthal | 1,032.38 mi (1,661.46 km) |
| Idanha-a-Nova to Oelde | 1,102.52 mi (1,774.33 km) |
| Idanha-a-Nova to Oelsnitz | 1,185.34 mi (1,907.62 km) |
| Idanha-a-Nova to Oer-Erkenschwick | 1,065.38 mi (1,714.57 km) |
