| Helsinki to Obernburg am Main | 944.48 mi (1,520.00 km) |
| Helsinki to Obernkirchen | 813.33 mi (1,308.93 km) |
| Helsinki to Oberschleissheim | 980.95 mi (1,578.69 km) |
| Helsinki to Oberstdorf | 1,060.34 mi (1,706.45 km) |
| Helsinki to Obertraubling | 924.41 mi (1,487.69 km) |
| Helsinki to Obertshausen | 939.66 mi (1,512.24 km) |
| Helsinki to Oberursel | 938.77 mi (1,510.81 km) |
| Helsinki to Ochsenfurt | 932.21 mi (1,500.25 km) |
| Helsinki to Ochsenhausen | 1,027.90 mi (1,654.25 km) |
| Helsinki to Ochtrup | 871.86 mi (1,403.13 km) |
| Helsinki to Odenthal | 933.93 mi (1,503.01 km) |
| Helsinki to Oelde | 863.02 mi (1,388.90 km) |
| Helsinki to Oelsnitz | 837.54 mi (1,347.89 km) |
| Helsinki to Oer-Erkenschwick | 898.54 mi (1,446.07 km) |
| Helsinki to Oerlinghausen | 841.52 mi (1,354.30 km) |
