| Swansea to Olivares | 4,391.12 mi (7,066.83 km) |
| Swansea to Olivenza | 4,303.15 mi (6,925.24 km) |
| Swansea to Olot | 4,617.53 mi (7,431.20 km) |
| Swansea to Onate | 4,372.64 mi (7,037.08 km) |
| Swansea to Onda | 4,575.53 mi (7,363.60 km) |
| Swansea to Onteniente | 4,600.96 mi (7,404.53 km) |
| Swansea to Orihuela | 4,611.98 mi (7,422.27 km) |
| Swansea to Osuna | 4,447.43 mi (7,157.44 km) |
| Swansea to Ourense | 4,150.39 mi (6,679.41 km) |
| Swansea to Oviedo | 4,209.64 mi (6,774.75 km) |
| Swansea to Paiporta | 4,587.74 mi (7,383.25 km) |
| Swansea to Pajara | 4,309.31 mi (6,935.16 km) |
| Swansea to Palafolls | 4,647.70 mi (7,479.76 km) |
| Swansea to Palafrugell | 4,656.56 mi (7,494.01 km) |
| Swansea to Palamos | 4,657.71 mi (7,495.86 km) |
