| Seaham to Cascais | 1,176.98 mi (1,894.17 km) |
| Seaham to Castelo Branco | 1,076.32 mi (1,732.17 km) |
| Seaham to Castro Daire | 1,009.38 mi (1,624.44 km) |
| Seaham to Celorico de Basto | 978.13 mi (1,574.16 km) |
| Seaham to Chamusca | 1,120.35 mi (1,803.02 km) |
| Seaham to Chaves | 947.06 mi (1,524.14 km) |
| Seaham to Cinfaes | 998.86 mi (1,607.50 km) |
| Seaham to Coimbra | 1,062.18 mi (1,709.41 km) |
| Seaham to Condeixa-a-Nova | 1,069.47 mi (1,721.14 km) |
| Seaham to Corroios | 1,178.76 mi (1,897.03 km) |
| Seaham to Coruche | 1,147.21 mi (1,846.25 km) |
| Seaham to Costa de Caparica | 1,178.00 mi (1,895.81 km) |
| Seaham to Covilha | 1,044.97 mi (1,681.72 km) |
| Seaham to Eiras | 1,060.04 mi (1,705.97 km) |
| Seaham to Elvas | 1,136.31 mi (1,828.72 km) |
