| Calais to Obernburg am Main | 329.74 mi (530.67 km) |
| Calais to Obernkirchen | 324.47 mi (522.18 km) |
| Calais to Oberschleissheim | 472.65 mi (760.66 km) |
| Calais to Oberstdorf | 451.79 mi (727.09 km) |
| Calais to Obertraubling | 477.89 mi (769.09 km) |
| Calais to Obertshausen | 312.44 mi (502.83 km) |
| Calais to Oberursel | 299.23 mi (481.56 km) |
| Calais to Ochsenfurt | 373.08 mi (600.42 km) |
| Calais to Ochsenhausen | 413.52 mi (665.50 km) |
| Calais to Ochtrup | 244.89 mi (394.11 km) |
| Calais to Odenthal | 228.80 mi (368.22 km) |
| Calais to Oelde | 278.06 mi (447.49 km) |
| Calais to Oelsnitz | 452.49 mi (728.21 km) |
| Calais to Oer-Erkenschwick | 237.89 mi (382.84 km) |
| Calais to Oerlinghausen | 301.40 mi (485.06 km) |
