| Swansea to Oerlinghausen | 4,509.55 mi (7,257.42 km) |
| Swansea to Oestrich-Winkel | 4,556.56 mi (7,333.08 km) |
| Swansea to Offenburg | 4,610.57 mi (7,419.99 km) |
| Swansea to Oftersheim | 4,601.89 mi (7,406.03 km) |
| Swansea to Ohrdruf | 4,626.93 mi (7,446.33 km) |
| Swansea to Ohringen | 4,642.93 mi (7,472.07 km) |
| Swansea to Olbernhau | 4,727.20 mi (7,607.69 km) |
| Swansea to Olching | 4,750.23 mi (7,644.75 km) |
| Swansea to Oldenburg | 4,451.07 mi (7,163.30 km) |
| Swansea to Oldenburg in Holstein | 4,502.31 mi (7,245.77 km) |
| Swansea to Olfen | 4,471.71 mi (7,196.51 km) |
| Swansea to Olpe | 4,513.37 mi (7,263.57 km) |
| Swansea to Olsberg | 4,525.26 mi (7,282.71 km) |
| Swansea to Oranienburg | 4,641.69 mi (7,470.09 km) |
| Swansea to Ortenberg | 4,582.94 mi (7,375.52 km) |
