| Cwmbran to Oberkirch | 536.63 mi (863.62 km) |
| Cwmbran to Obernburg am Main | 545.58 mi (878.03 km) |
| Cwmbran to Obernkirchen | 517.95 mi (833.56 km) |
| Cwmbran to Oberschleissheim | 688.40 mi (1,107.87 km) |
| Cwmbran to Oberstdorf | 663.27 mi (1,067.43 km) |
| Cwmbran to Obertraubling | 693.98 mi (1,116.86 km) |
| Cwmbran to Obertshausen | 527.86 mi (849.51 km) |
| Cwmbran to Oberursel | 514.33 mi (827.74 km) |
| Cwmbran to Ochsenfurt | 588.93 mi (947.79 km) |
| Cwmbran to Ochsenhausen | 627.27 mi (1,009.50 km) |
| Cwmbran to Ochtrup | 436.36 mi (702.26 km) |
| Cwmbran to Odenthal | 439.27 mi (706.93 km) |
| Cwmbran to Oelde | 477.61 mi (768.64 km) |
| Cwmbran to Oelsnitz | 664.17 mi (1,068.87 km) |
| Cwmbran to Oer-Erkenschwick | 440.01 mi (708.13 km) |
