| North Charleston to Orbetello | 4,791.38 mi (7,710.99 km) |
| North Charleston to Oria | 5,147.49 mi (8,284.08 km) |
| North Charleston to Oristano | 4,745.47 mi (7,637.10 km) |
| North Charleston to Orta Nova | 5,031.89 mi (8,098.04 km) |
| North Charleston to Orte | 4,844.26 mi (7,796.08 km) |
| North Charleston to Ortona | 4,938.94 mi (7,948.46 km) |
| North Charleston to Orvieto | 4,823.70 mi (7,763.00 km) |
| North Charleston to Orzinuovi | 4,646.28 mi (7,477.47 km) |
| North Charleston to Osimo | 4,861.56 mi (7,823.93 km) |
| North Charleston to Ospitaletto | 4,648.01 mi (7,480.26 km) |
| North Charleston to Ostuni | 5,137.10 mi (8,267.36 km) |
| North Charleston to Ottaviano | 4,991.56 mi (8,033.13 km) |
| North Charleston to Ovada | 4,610.51 mi (7,419.90 km) |
| North Charleston to Ozieri | 4,744.69 mi (7,635.84 km) |
| North Charleston to Paceco | 4,995.28 mi (8,039.13 km) |
