| Halikko to Oria | 1,394.34 mi (2,243.98 km) |
| Halikko to Oristano | 1,546.32 mi (2,488.57 km) |
| Halikko to Orta Nova | 1,353.97 mi (2,179.01 km) |
| Halikko to Orte | 1,318.22 mi (2,121.47 km) |
| Halikko to Ortona | 1,299.28 mi (2,091.00 km) |
| Halikko to Orvieto | 1,305.14 mi (2,100.42 km) |
| Halikko to Orzinuovi | 1,167.17 mi (1,878.38 km) |
| Halikko to Osimo | 1,235.03 mi (1,987.59 km) |
| Halikko to Ospitaletto | 1,154.65 mi (1,858.23 km) |
| Halikko to Ostuni | 1,378.73 mi (2,218.86 km) |
| Halikko to Ottaviano | 1,399.45 mi (2,252.19 km) |
| Halikko to Ovada | 1,240.21 mi (1,995.93 km) |
| Halikko to Ozieri | 1,494.89 mi (2,405.80 km) |
| Halikko to Paceco | 1,615.34 mi (2,599.64 km) |
| Halikko to Pachino | 1,673.54 mi (2,693.30 km) |
