| Oulu to Obernburg am Main | 1,203.50 mi (1,936.84 km) |
| Oulu to Obernkirchen | 1,052.10 mi (1,693.19 km) |
| Oulu to Oberschleissheim | 1,266.53 mi (2,038.28 km) |
| Oulu to Oberstdorf | 1,340.96 mi (2,158.07 km) |
| Oulu to Obertraubling | 1,210.86 mi (1,948.70 km) |
| Oulu to Obertshausen | 1,194.66 mi (1,922.61 km) |
| Oulu to Oberursel | 1,190.71 mi (1,916.27 km) |
| Oulu to Ochsenfurt | 1,199.64 mi (1,930.63 km) |
| Oulu to Ochsenhausen | 1,303.19 mi (2,097.28 km) |
| Oulu to Ochtrup | 1,094.10 mi (1,760.79 km) |
| Oulu to Odenthal | 1,167.02 mi (1,878.14 km) |
| Oulu to Oelde | 1,097.49 mi (1,766.24 km) |
| Oulu to Oelsnitz | 1,116.44 mi (1,796.74 km) |
| Oulu to Oer-Erkenschwick | 1,127.07 mi (1,813.84 km) |
| Oulu to Oerlinghausen | 1,079.23 mi (1,736.86 km) |
