| Seclin to Setubal | 1,014.59 mi (1,632.82 km) |
| Seclin to Sever do Vouga | 871.42 mi (1,402.41 km) |
| Seclin to Silves | 1,082.81 mi (1,742.62 km) |
| Seclin to Sines | 1,047.68 mi (1,686.07 km) |
| Seclin to Sintra | 1,012.61 mi (1,629.64 km) |
| Seclin to Sobrado de Paiva | 851.49 mi (1,370.35 km) |
| Seclin to Sobral de Monte Agraco | 993.03 mi (1,598.13 km) |
| Seclin to Soure | 918.26 mi (1,477.80 km) |
| Seclin to Tabua | 882.74 mi (1,420.63 km) |
| Seclin to Tavira | 1,067.37 mi (1,717.76 km) |
| Seclin to Tomar | 937.97 mi (1,509.52 km) |
| Seclin to Tondela | 875.32 mi (1,408.70 km) |
| Seclin to Torre de Moncorvo | 808.49 mi (1,301.13 km) |
| Seclin to Torres Novas | 949.08 mi (1,527.40 km) |
| Seclin to Torres Vedras | 992.58 mi (1,597.40 km) |
