| Southborough to Sesena | 787.24 mi (1,266.94 km) |
| Southborough to Sestao | 563.45 mi (906.79 km) |
| Southborough to Sevilla | 1,009.52 mi (1,624.66 km) |
| Southborough to Sevilla La Nueva | 774.86 mi (1,247.01 km) |
| Southborough to Silla | 815.81 mi (1,312.93 km) |
| Southborough to Silleda | 707.81 mi (1,139.11 km) |
| Southborough to Sitges | 689.71 mi (1,109.98 km) |
| Southborough to Socuellamos | 833.11 mi (1,340.76 km) |
| Southborough to Soller | 795.86 mi (1,280.82 km) |
| Southborough to Solsona | 636.03 mi (1,023.59 km) |
| Southborough to Son Servera | 811.09 mi (1,305.33 km) |
| Southborough to Sonseca | 817.39 mi (1,315.47 km) |
| Southborough to Sopelana | 558.40 mi (898.66 km) |
| Southborough to Soria | 661.77 mi (1,065.02 km) |
| Southborough to Suances | 570.61 mi (918.30 km) |
