| Hilton Head Island to Orbetello | 4,853.04 mi (7,810.21 km) |
| Hilton Head Island to Oria | 5,209.29 mi (8,383.54 km) |
| Hilton Head Island to Oristano | 4,806.17 mi (7,734.78 km) |
| Hilton Head Island to Orta Nova | 5,093.69 mi (8,197.50 km) |
| Hilton Head Island to Orte | 4,906.02 mi (7,895.47 km) |
| Hilton Head Island to Ortona | 5,000.85 mi (8,048.09 km) |
| Hilton Head Island to Orvieto | 4,885.50 mi (7,862.45 km) |
| Hilton Head Island to Orzinuovi | 4,708.50 mi (7,577.60 km) |
| Hilton Head Island to Osimo | 4,923.64 mi (7,923.83 km) |
| Hilton Head Island to Ospitaletto | 4,710.27 mi (7,580.45 km) |
| Hilton Head Island to Ostuni | 5,198.94 mi (8,366.89 km) |
| Hilton Head Island to Ottaviano | 5,053.13 mi (8,132.23 km) |
| Hilton Head Island to Ovada | 4,672.48 mi (7,519.63 km) |
| Hilton Head Island to Ozieri | 4,805.63 mi (7,733.92 km) |
| Hilton Head Island to Paceco | 5,055.87 mi (8,136.63 km) |
