| Ciampino to Oberkirch | 514.40 mi (827.85 km) |
| Ciampino to Obernburg am Main | 579.77 mi (933.05 km) |
| Ciampino to Obernkirchen | 741.29 mi (1,192.99 km) |
| Ciampino to Oberschleissheim | 448.49 mi (721.77 km) |
| Ciampino to Oberstdorf | 404.01 mi (650.18 km) |
| Ciampino to Obertraubling | 495.55 mi (797.51 km) |
| Ciampino to Obertshausen | 598.96 mi (963.94 km) |
| Ciampino to Oberursel | 611.64 mi (984.34 km) |
| Ciampino to Ochsenfurt | 555.89 mi (894.61 km) |
| Ciampino to Ochsenhausen | 452.29 mi (727.88 km) |
| Ciampino to Ochtrup | 762.27 mi (1,226.75 km) |
| Ciampino to Odenthal | 688.87 mi (1,108.63 km) |
| Ciampino to Oelde | 724.11 mi (1,165.34 km) |
| Ciampino to Oelsnitz | 595.72 mi (958.71 km) |
| Ciampino to Oer-Erkenschwick | 725.20 mi (1,167.10 km) |
