| Chapel Hill to Orbetello | 4,618.09 mi (7,432.10 km) |
| Chapel Hill to Oria | 4,972.62 mi (8,002.65 km) |
| Chapel Hill to Oristano | 4,580.23 mi (7,371.17 km) |
| Chapel Hill to Orta Nova | 4,857.08 mi (7,816.71 km) |
| Chapel Hill to Orte | 4,669.95 mi (7,515.55 km) |
| Chapel Hill to Ortona | 4,763.18 mi (7,665.59 km) |
| Chapel Hill to Orvieto | 4,649.07 mi (7,481.96 km) |
| Chapel Hill to Orzinuovi | 4,467.60 mi (7,189.91 km) |
| Chapel Hill to Osimo | 4,684.21 mi (7,538.51 km) |
| Chapel Hill to Ospitaletto | 4,468.91 mi (7,192.01 km) |
| Chapel Hill to Ostuni | 4,961.81 mi (7,985.26 km) |
| Chapel Hill to Ottaviano | 4,818.85 mi (7,755.18 km) |
| Chapel Hill to Ovada | 4,434.40 mi (7,136.48 km) |
| Chapel Hill to Ozieri | 4,577.48 mi (7,366.74 km) |
| Chapel Hill to Paceco | 4,830.68 mi (7,774.23 km) |
