| Keystone to Sesimbra | 4,194.28 mi (6,750.04 km) |
| Keystone to Setubal | 4,203.76 mi (6,765.30 km) |
| Keystone to Sever do Vouga | 4,194.59 mi (6,750.55 km) |
| Keystone to Silves | 4,251.17 mi (6,841.59 km) |
| Keystone to Sines | 4,215.03 mi (6,783.44 km) |
| Keystone to Sintra | 4,173.21 mi (6,716.14 km) |
| Keystone to Sobrado de Paiva | 4,194.92 mi (6,751.08 km) |
| Keystone to Sobral de Monte Agraco | 4,181.93 mi (6,730.17 km) |
| Keystone to Soure | 4,191.92 mi (6,746.24 km) |
| Keystone to Tabua | 4,217.85 mi (6,787.97 km) |
| Keystone to Tavira | 4,294.34 mi (6,911.07 km) |
| Keystone to Tomar | 4,210.46 mi (6,776.08 km) |
| Keystone to Tondela | 4,212.53 mi (6,779.41 km) |
| Keystone to Torre de Moncorvo | 4,249.61 mi (6,839.08 km) |
| Keystone to Torres Novas | 4,206.64 mi (6,769.94 km) |
