| Horten to Orbetello | 1,173.77 mi (1,889.00 km) |
| Horten to Oria | 1,344.05 mi (2,163.04 km) |
| Horten to Oristano | 1,350.74 mi (2,173.81 km) |
| Horten to Orta Nova | 1,270.39 mi (2,044.50 km) |
| Horten to Orte | 1,174.81 mi (1,890.68 km) |
| Horten to Ortona | 1,191.57 mi (1,917.64 km) |
| Horten to Orvieto | 1,156.24 mi (1,860.78 km) |
| Horten to Orzinuovi | 968.97 mi (1,559.40 km) |
| Horten to Osimo | 1,108.69 mi (1,784.26 km) |
| Horten to Ospitaletto | 958.13 mi (1,541.96 km) |
| Horten to Ostuni | 1,327.73 mi (2,136.77 km) |
| Horten to Ottaviano | 1,294.98 mi (2,084.07 km) |
| Horten to Ovada | 1,024.04 mi (1,648.03 km) |
| Horten to Ozieri | 1,302.91 mi (2,096.83 km) |
| Horten to Paceco | 1,484.15 mi (2,388.51 km) |
