| Hillerod to Oria | 1,093.27 mi (1,759.44 km) |
| Hillerod to Oristano | 1,120.34 mi (1,803.01 km) |
| Hillerod to Orta Nova | 1,020.46 mi (1,642.27 km) |
| Hillerod to Orte | 930.90 mi (1,498.14 km) |
| Hillerod to Ortona | 943.12 mi (1,517.80 km) |
| Hillerod to Orvieto | 913.11 mi (1,469.52 km) |
| Hillerod to Orzinuovi | 735.11 mi (1,183.05 km) |
| Hillerod to Osimo | 861.76 mi (1,386.86 km) |
| Hillerod to Ospitaletto | 723.63 mi (1,164.57 km) |
| Hillerod to Ostuni | 1,076.94 mi (1,733.17 km) |
| Hillerod to Ottaviano | 1,046.73 mi (1,684.55 km) |
| Hillerod to Ovada | 796.70 mi (1,282.17 km) |
| Hillerod to Ozieri | 1,071.06 mi (1,723.70 km) |
| Hillerod to Paceco | 1,240.27 mi (1,996.02 km) |
| Hillerod to Pachino | 1,334.09 mi (2,147.02 km) |
