| Seia to Setubal | 145.67 mi (234.44 km) |
| Seia to Sever do Vouga | 40.96 mi (65.92 km) |
| Seia to Silves | 227.01 mi (365.34 km) |
| Seia to Sines | 181.47 mi (292.05 km) |
| Seia to Sintra | 143.61 mi (231.11 km) |
| Seia to Sobrado de Paiva | 51.55 mi (82.95 km) |
| Seia to Sobral de Monte Agraco | 123.87 mi (199.35 km) |
| Seia to Soure | 55.42 mi (89.19 km) |
| Seia to Tabua | 17.72 mi (28.51 km) |
| Seia to Tavira | 228.39 mi (367.56 km) |
| Seia to Tomar | 68.22 mi (109.80 km) |
| Seia to Tondela | 21.06 mi (33.90 km) |
| Seia to Torre de Moncorvo | 61.44 mi (98.88 km) |
| Seia to Torres Novas | 79.33 mi (127.67 km) |
| Seia to Torres Vedras | 124.33 mi (200.10 km) |
