| Ardea to Oberkirch | 525.01 mi (844.92 km) |
| Ardea to Obernburg am Main | 591.31 mi (951.63 km) |
| Ardea to Obernkirchen | 753.20 mi (1,212.16 km) |
| Ardea to Oberschleissheim | 460.82 mi (741.62 km) |
| Ardea to Oberstdorf | 415.55 mi (668.76 km) |
| Ardea to Obertraubling | 508.11 mi (817.73 km) |
| Ardea to Obertshausen | 610.43 mi (982.39 km) |
| Ardea to Oberursel | 623.03 mi (1,002.67 km) |
| Ardea to Ochsenfurt | 567.78 mi (913.75 km) |
| Ardea to Ochsenhausen | 463.81 mi (746.43 km) |
| Ardea to Ochtrup | 773.59 mi (1,244.97 km) |
| Ardea to Odenthal | 699.89 mi (1,126.36 km) |
| Ardea to Oelde | 735.67 mi (1,183.94 km) |
| Ardea to Oelsnitz | 608.30 mi (978.96 km) |
| Ardea to Oer-Erkenschwick | 736.42 mi (1,185.16 km) |
