| Duffel to Obernburg am Main | 221.18 mi (355.95 km) |
| Duffel to Obernkirchen | 212.89 mi (342.62 km) |
| Duffel to Oberschleissheim | 371.43 mi (597.76 km) |
| Duffel to Oberstdorf | 363.86 mi (585.58 km) |
| Duffel to Obertraubling | 369.94 mi (595.36 km) |
| Duffel to Obertshausen | 202.35 mi (325.65 km) |
| Duffel to Oberursel | 188.32 mi (303.07 km) |
| Duffel to Ochsenfurt | 264.20 mi (425.19 km) |
| Duffel to Ochsenhausen | 320.72 mi (516.14 km) |
| Duffel to Ochtrup | 137.72 mi (221.64 km) |
| Duffel to Odenthal | 112.98 mi (181.82 km) |
| Duffel to Oelde | 164.37 mi (264.53 km) |
| Duffel to Oelsnitz | 337.52 mi (543.19 km) |
| Duffel to Oer-Erkenschwick | 123.73 mi (199.12 km) |
| Duffel to Oerlinghausen | 188.12 mi (302.75 km) |
