| Seclin to Bombarral | 978.63 mi (1,574.95 km) |
| Seclin to Bougado | 843.62 mi (1,357.68 km) |
| Seclin to Braga | 827.53 mi (1,331.79 km) |
| Seclin to Braganca | 762.89 mi (1,227.76 km) |
| Seclin to Cabeceiras de Basto | 815.93 mi (1,313.11 km) |
| Seclin to Cacem | 1,011.96 mi (1,628.60 km) |
| Seclin to Cadaval | 979.02 mi (1,575.58 km) |
| Seclin to Caldas da Rainha | 970.03 mi (1,561.11 km) |
| Seclin to Calheta | 1,602.86 mi (2,579.56 km) |
| Seclin to Camara de Lobos | 1,598.56 mi (2,572.63 km) |
| Seclin to Canico | 1,597.58 mi (2,571.06 km) |
| Seclin to Cantanhede | 900.19 mi (1,448.71 km) |
| Seclin to Carregal do Sal | 877.68 mi (1,412.49 km) |
| Seclin to Cartaxo | 974.72 mi (1,568.66 km) |
| Seclin to Cascais | 1,019.21 mi (1,640.26 km) |
