| Seaham to Arcos de Valdevez | 953.58 mi (1,534.64 km) |
| Seaham to Arcozelo | 1,009.23 mi (1,624.20 km) |
| Seaham to Arganil | 1,056.54 mi (1,700.33 km) |
| Seaham to Arouca | 1,011.49 mi (1,627.84 km) |
| Seaham to Arruda dos Vinhos | 1,153.01 mi (1,855.59 km) |
| Seaham to Aveiro | 1,037.33 mi (1,669.43 km) |
| Seaham to Aver-o-Mar | 988.22 mi (1,590.39 km) |
| Seaham to Aves | 978.71 mi (1,575.08 km) |
| Seaham to Azambuja | 1,144.59 mi (1,842.04 km) |
| Seaham to Baiao | 993.01 mi (1,598.09 km) |
| Seaham to Barcelos | 978.42 mi (1,574.62 km) |
| Seaham to Barreiro | 1,174.09 mi (1,889.52 km) |
| Seaham to Batalha | 1,104.81 mi (1,778.02 km) |
| Seaham to Beja | 1,201.02 mi (1,932.86 km) |
| Seaham to Belas | 1,169.83 mi (1,882.66 km) |
