| North Hykeham to Orbetello | 919.88 mi (1,480.40 km) |
| North Hykeham to Oria | 1,221.80 mi (1,966.29 km) |
| North Hykeham to Oristano | 1,013.88 mi (1,631.68 km) |
| North Hykeham to Orta Nova | 1,115.03 mi (1,794.47 km) |
| North Hykeham to Orte | 951.52 mi (1,531.32 km) |
| North Hykeham to Ortona | 1,018.09 mi (1,638.46 km) |
| North Hykeham to Orvieto | 928.88 mi (1,494.89 km) |
| North Hykeham to Orzinuovi | 715.45 mi (1,151.40 km) |
| North Hykeham to Osimo | 927.87 mi (1,493.26 km) |
| North Hykeham to Ospitaletto | 711.15 mi (1,144.49 km) |
| North Hykeham to Ostuni | 1,207.52 mi (1,943.31 km) |
| North Hykeham to Ottaviano | 1,104.33 mi (1,777.25 km) |
| North Hykeham to Ovada | 722.84 mi (1,163.29 km) |
| North Hykeham to Ozieri | 979.24 mi (1,575.94 km) |
| North Hykeham to Paceco | 1,223.04 mi (1,968.30 km) |
