| SeaTac to Sesimbra | 5,220.84 mi (8,402.12 km) |
| SeaTac to Setubal | 5,223.74 mi (8,406.80 km) |
| SeaTac to Sever do Vouga | 5,124.63 mi (8,247.30 km) |
| SeaTac to Silves | 5,310.69 mi (8,546.74 km) |
| SeaTac to Sines | 5,254.96 mi (8,457.04 km) |
| SeaTac to Sintra | 5,192.01 mi (8,355.72 km) |
| SeaTac to Sobrado de Paiva | 5,112.10 mi (8,227.14 km) |
| SeaTac to Sobral de Monte Agraco | 5,188.62 mi (8,350.28 km) |
| SeaTac to Soure | 5,151.79 mi (8,291.01 km) |
| SeaTac to Tabua | 5,155.77 mi (8,297.41 km) |
| SeaTac to Tavira | 5,341.93 mi (8,597.01 km) |
| SeaTac to Tomar | 5,183.02 mi (8,341.26 km) |
| SeaTac to Tondela | 5,145.64 mi (8,281.11 km) |
| SeaTac to Torre de Moncorvo | 5,140.95 mi (8,273.56 km) |
| SeaTac to Torres Novas | 5,186.11 mi (8,346.24 km) |
