| Seclin to Castelo Branco | 899.59 mi (1,447.75 km) |
| Seclin to Castro Daire | 849.01 mi (1,366.36 km) |
| Seclin to Celorico de Basto | 823.77 mi (1,325.73 km) |
| Seclin to Chamusca | 954.47 mi (1,536.08 km) |
| Seclin to Chaves | 787.74 mi (1,267.75 km) |
| Seclin to Cinfaes | 843.70 mi (1,357.80 km) |
| Seclin to Coimbra | 903.01 mi (1,453.25 km) |
| Seclin to Condeixa-a-Nova | 910.51 mi (1,465.32 km) |
| Seclin to Corroios | 1,016.55 mi (1,635.99 km) |
| Seclin to Coruche | 978.81 mi (1,575.24 km) |
| Seclin to Costa de Caparica | 1,017.23 mi (1,637.07 km) |
| Seclin to Covilha | 872.12 mi (1,403.54 km) |
| Seclin to Eiras | 901.08 mi (1,450.15 km) |
| Seclin to Elvas | 947.40 mi (1,524.69 km) |
| Seclin to Entroncamento | 947.30 mi (1,524.53 km) |
