| Humlebaek to Oria | 1,093.08 mi (1,759.15 km) |
| Humlebaek to Oristano | 1,123.70 mi (1,808.42 km) |
| Humlebaek to Orta Nova | 1,020.99 mi (1,643.13 km) |
| Humlebaek to Orte | 932.84 mi (1,501.25 km) |
| Humlebaek to Ortona | 944.15 mi (1,519.47 km) |
| Humlebaek to Orvieto | 915.17 mi (1,472.83 km) |
| Humlebaek to Orzinuovi | 738.33 mi (1,188.23 km) |
| Humlebaek to Osimo | 863.17 mi (1,389.14 km) |
| Humlebaek to Ospitaletto | 726.79 mi (1,169.66 km) |
| Humlebaek to Ostuni | 1,076.76 mi (1,732.87 km) |
| Humlebaek to Ottaviano | 1,047.80 mi (1,686.27 km) |
| Humlebaek to Ovada | 800.45 mi (1,288.21 km) |
| Humlebaek to Ozieri | 1,074.31 mi (1,728.94 km) |
| Humlebaek to Paceco | 1,242.15 mi (1,999.04 km) |
| Humlebaek to Pachino | 1,335.09 mi (2,148.62 km) |
