| Southborough to Sinop | 1,752.50 mi (2,820.38 km) |
| Southborough to Siran | 1,994.98 mi (3,210.61 km) |
| Southborough to Sirnak | 2,249.11 mi (3,619.60 km) |
| Southborough to Sirvan | 2,207.39 mi (3,552.45 km) |
| Southborough to Sivas | 1,922.34 mi (3,093.71 km) |
| Southborough to Sivasli | 1,670.09 mi (2,687.75 km) |
| Southborough to Siverek | 2,104.87 mi (3,387.46 km) |
| Southborough to Sivrice | 2,074.80 mi (3,339.07 km) |
| Southborough to Sivrihisar | 1,703.58 mi (2,741.65 km) |
| Southborough to Sogut | 1,622.72 mi (2,611.52 km) |
| Southborough to Sogutlu | 1,598.32 mi (2,572.25 km) |
| Southborough to Soke | 1,613.13 mi (2,596.08 km) |
| Southborough to Solhan | 2,127.61 mi (3,424.06 km) |
| Southborough to Soma | 1,553.98 mi (2,500.90 km) |
| Southborough to Sorgun | 1,841.89 mi (2,964.24 km) |
