| Mortsel to Obernburg am Main | 224.90 mi (361.95 km) |
| Mortsel to Obernkirchen | 213.06 mi (342.88 km) |
| Mortsel to Oberschleissheim | 375.58 mi (604.44 km) |
| Mortsel to Oberstdorf | 368.57 mi (593.15 km) |
| Mortsel to Obertraubling | 373.60 mi (601.25 km) |
| Mortsel to Obertshausen | 205.93 mi (331.41 km) |
| Mortsel to Oberursel | 191.82 mi (308.70 km) |
| Mortsel to Ochsenfurt | 267.84 mi (431.05 km) |
| Mortsel to Ochsenhausen | 325.29 mi (523.51 km) |
| Mortsel to Ochtrup | 136.97 mi (220.43 km) |
| Mortsel to Odenthal | 115.34 mi (185.62 km) |
| Mortsel to Oelde | 164.96 mi (265.48 km) |
| Mortsel to Oelsnitz | 340.12 mi (547.36 km) |
| Mortsel to Oer-Erkenschwick | 124.41 mi (200.21 km) |
| Mortsel to Oerlinghausen | 188.63 mi (303.57 km) |
