| Houston to Sinop | 6,561.11 mi (10,559.09 km) |
| Houston to Siran | 6,791.46 mi (10,929.80 km) |
| Houston to Sirnak | 7,046.96 mi (11,340.98 km) |
| Houston to Sirvan | 7,002.78 mi (11,269.88 km) |
| Houston to Sivas | 6,743.82 mi (10,853.14 km) |
| Houston to Sivasli | 6,540.37 mi (10,525.70 km) |
| Houston to Siverek | 6,929.28 mi (11,151.59 km) |
| Houston to Sivrice | 6,891.58 mi (11,090.93 km) |
| Houston to Sivrihisar | 6,563.17 mi (10,562.40 km) |
| Houston to Sogut | 6,484.60 mi (10,435.95 km) |
| Houston to Sogutlu | 6,452.68 mi (10,384.58 km) |
| Houston to Soke | 6,486.17 mi (10,438.48 km) |
| Houston to Solhan | 6,921.16 mi (11,138.53 km) |
| Houston to Soma | 6,426.13 mi (10,341.86 km) |
| Houston to Sorgun | 6,676.93 mi (10,745.48 km) |
