| Round Rock to Sesimbra | 4,875.67 mi (7,846.64 km) |
| Round Rock to Setubal | 4,883.62 mi (7,859.43 km) |
| Round Rock to Sever do Vouga | 4,847.33 mi (7,801.02 km) |
| Round Rock to Silves | 4,944.41 mi (7,957.26 km) |
| Round Rock to Sines | 4,901.17 mi (7,887.67 km) |
| Round Rock to Sintra | 4,851.47 mi (7,807.68 km) |
| Round Rock to Sobrado de Paiva | 4,843.79 mi (7,795.32 km) |
| Round Rock to Sobral de Monte Agraco | 4,856.99 mi (7,816.56 km) |
| Round Rock to Soure | 4,853.49 mi (7,810.93 km) |
| Round Rock to Tabua | 4,873.95 mi (7,843.87 km) |
| Round Rock to Tavira | 4,985.84 mi (8,023.93 km) |
| Round Rock to Tomar | 4,876.60 mi (7,848.12 km) |
| Round Rock to Tondela | 4,866.97 mi (7,832.62 km) |
| Round Rock to Torre de Moncorvo | 4,893.04 mi (7,874.59 km) |
| Round Rock to Torres Novas | 4,874.67 mi (7,845.03 km) |
