| Zaventem to Obernburg am Main | 218.25 mi (351.24 km) |
| Zaventem to Obernkirchen | 221.35 mi (356.23 km) |
| Zaventem to Oberschleissheim | 366.28 mi (589.48 km) |
| Zaventem to Oberstdorf | 355.63 mi (572.33 km) |
| Zaventem to Obertraubling | 367.03 mi (590.68 km) |
| Zaventem to Obertshausen | 200.09 mi (322.02 km) |
| Zaventem to Oberursel | 186.46 mi (300.08 km) |
| Zaventem to Ochsenfurt | 261.52 mi (420.87 km) |
| Zaventem to Ochsenhausen | 313.35 mi (504.29 km) |
| Zaventem to Ochtrup | 148.45 mi (238.91 km) |
| Zaventem to Odenthal | 115.79 mi (186.34 km) |
| Zaventem to Oelde | 171.91 mi (276.67 km) |
| Zaventem to Oelsnitz | 338.71 mi (545.10 km) |
| Zaventem to Oer-Erkenschwick | 131.28 mi (211.28 km) |
| Zaventem to Oerlinghausen | 195.78 mi (315.08 km) |
