| Swansea to Oberkirch | 4,613.88 mi (7,425.32 km) |
| Swansea to Obernburg am Main | 4,605.37 mi (7,411.62 km) |
| Swansea to Obernkirchen | 4,514.93 mi (7,266.08 km) |
| Swansea to Oberschleissheim | 4,757.72 mi (7,656.81 km) |
| Swansea to Oberstdorf | 4,741.41 mi (7,630.57 km) |
| Swansea to Obertraubling | 4,751.98 mi (7,647.57 km) |
| Swansea to Obertshausen | 4,585.39 mi (7,379.47 km) |
| Swansea to Oberursel | 4,570.74 mi (7,355.90 km) |
| Swansea to Ochsenfurt | 4,647.15 mi (7,478.87 km) |
| Swansea to Ochsenhausen | 4,703.03 mi (7,568.79 km) |
| Swansea to Ochtrup | 4,447.36 mi (7,157.34 km) |
| Swansea to Odenthal | 4,486.16 mi (7,219.78 km) |
| Swansea to Oelde | 4,495.59 mi (7,234.95 km) |
| Swansea to Oelsnitz | 4,694.96 mi (7,555.80 km) |
| Swansea to Oer-Erkenschwick | 4,469.48 mi (7,192.93 km) |
