| Swansea to Montalegre | 4,169.65 mi (6,710.41 km) |
| Swansea to Montemor-o-Novo | 4,251.44 mi (6,842.03 km) |
| Swansea to Montemor-o-Velho | 4,180.49 mi (6,727.84 km) |
| Swansea to Montijo | 4,217.85 mi (6,787.98 km) |
| Swansea to Mortagua | 4,193.07 mi (6,748.09 km) |
| Swansea to Moura | 4,304.98 mi (6,928.19 km) |
| Swansea to Murtosa | 4,164.91 mi (6,702.78 km) |
| Swansea to Nazare | 4,180.47 mi (6,727.81 km) |
| Swansea to Nelas | 4,208.28 mi (6,772.57 km) |
| Swansea to Obidos | 4,183.88 mi (6,733.30 km) |
| Swansea to Odemira | 4,266.66 mi (6,866.53 km) |
| Swansea to Odivelas | 4,201.07 mi (6,760.97 km) |
| Swansea to Oeiras | 4,197.99 mi (6,756.01 km) |
| Swansea to Olhao | 4,323.40 mi (6,957.84 km) |
| Swansea to Oliveira de Azemeis | 4,168.93 mi (6,709.24 km) |
