| Ciampino to Oerlinghausen | 726.31 mi (1,168.89 km) |
| Ciampino to Oestrich-Winkel | 607.91 mi (978.33 km) |
| Ciampino to Offenburg | 513.48 mi (826.37 km) |
| Ciampino to Oftersheim | 557.74 mi (897.60 km) |
| Ciampino to Ohrdruf | 630.06 mi (1,013.98 km) |
| Ciampino to Ohringen | 532.75 mi (857.38 km) |
| Ciampino to Olbernhau | 613.62 mi (987.53 km) |
| Ciampino to Olching | 446.60 mi (718.74 km) |
| Ciampino to Oldenburg | 809.72 mi (1,303.12 km) |
| Ciampino to Oldenburg in Holstein | 867.23 mi (1,395.67 km) |
| Ciampino to Olfen | 727.84 mi (1,171.34 km) |
| Ciampino to Olpe | 675.72 mi (1,087.47 km) |
| Ciampino to Olsberg | 687.91 mi (1,107.09 km) |
| Ciampino to Oranienburg | 757.46 mi (1,219.01 km) |
| Ciampino to Ortenberg | 614.89 mi (989.57 km) |
