| Hillegom to Orbetello | 746.81 mi (1,201.88 km) |
| Hillegom to Oria | 1,021.19 mi (1,643.45 km) |
| Hillegom to Oristano | 876.15 mi (1,410.03 km) |
| Hillegom to Orta Nova | 919.47 mi (1,479.75 km) |
| Hillegom to Orte | 769.64 mi (1,238.62 km) |
| Hillegom to Ortona | 824.50 mi (1,326.91 km) |
| Hillegom to Orvieto | 747.52 mi (1,203.02 km) |
| Hillegom to Orzinuovi | 533.85 mi (859.15 km) |
| Hillegom to Osimo | 733.49 mi (1,180.44 km) |
| Hillegom to Ospitaletto | 527.11 mi (848.30 km) |
| Hillegom to Ostuni | 1,006.24 mi (1,619.39 km) |
| Hillegom to Ottaviano | 917.31 mi (1,476.27 km) |
| Hillegom to Ovada | 559.78 mi (900.87 km) |
| Hillegom to Ozieri | 834.83 mi (1,343.53 km) |
| Hillegom to Paceco | 1,060.05 mi (1,705.99 km) |
