| Riverdale to Sesimbra | 4,103.25 mi (6,603.54 km) |
| Riverdale to Setubal | 4,111.78 mi (6,617.27 km) |
| Riverdale to Sever do Vouga | 4,085.66 mi (6,575.24 km) |
| Riverdale to Silves | 4,168.05 mi (6,707.83 km) |
| Riverdale to Sines | 4,127.14 mi (6,641.99 km) |
| Riverdale to Sintra | 4,080.10 mi (6,566.28 km) |
| Riverdale to Sobrado de Paiva | 4,083.66 mi (6,572.01 km) |
| Riverdale to Sobral de Monte Agraco | 4,086.81 mi (6,577.08 km) |
| Riverdale to Soure | 4,088.38 mi (6,579.62 km) |
| Riverdale to Tabua | 4,111.06 mi (6,616.11 km) |
| Riverdale to Tavira | 4,210.21 mi (6,775.68 km) |
| Riverdale to Tomar | 4,109.83 mi (6,614.13 km) |
| Riverdale to Tondela | 4,104.70 mi (6,605.88 km) |
| Riverdale to Torre de Moncorvo | 4,135.31 mi (6,655.14 km) |
| Riverdale to Torres Novas | 4,107.18 mi (6,609.86 km) |
