| Oulu to Oria | 1,722.18 mi (2,771.58 km) |
| Oulu to Oristano | 1,860.81 mi (2,994.69 km) |
| Oulu to Orta Nova | 1,681.04 mi (2,705.37 km) |
| Oulu to Orte | 1,639.83 mi (2,639.05 km) |
| Oulu to Ortona | 1,624.60 mi (2,614.54 km) |
| Oulu to Orvieto | 1,625.91 mi (2,616.65 km) |
| Oulu to Orzinuovi | 1,477.75 mi (2,378.20 km) |
| Oulu to Osimo | 1,558.16 mi (2,507.61 km) |
| Oulu to Ospitaletto | 1,465.44 mi (2,358.40 km) |
| Oulu to Ostuni | 1,706.57 mi (2,746.46 km) |
| Oulu to Ottaviano | 1,725.42 mi (2,776.80 km) |
| Oulu to Ovada | 1,547.47 mi (2,490.41 km) |
| Oulu to Ozieri | 1,809.76 mi (2,912.53 km) |
| Oulu to Paceco | 1,939.81 mi (3,121.82 km) |
| Oulu to Pachino | 2,000.88 mi (3,220.11 km) |
