| Houston to Solofra | 5,831.18 mi (9,384.38 km) |
| Houston to Somma Lombardo | 5,389.59 mi (8,673.70 km) |
| Houston to Somma Vesuviana | 5,811.94 mi (9,353.41 km) |
| Houston to Sommacampagna | 5,488.63 mi (8,833.10 km) |
| Houston to Sona | 5,486.72 mi (8,830.03 km) |
| Houston to Sondrio | 5,420.52 mi (8,723.49 km) |
| Houston to Sora | 5,743.79 mi (9,243.74 km) |
| Houston to Sorbolo | 5,492.28 mi (8,838.97 km) |
| Houston to Soresina | 5,451.74 mi (8,773.73 km) |
| Houston to Sorisole | 5,427.25 mi (8,734.31 km) |
| Houston to Sorrento | 5,818.87 mi (9,364.57 km) |
| Houston to Sorso | 5,558.10 mi (8,944.90 km) |
| Houston to Sortino | 5,985.52 mi (9,632.76 km) |
| Houston to Soverato Marina | 5,991.17 mi (9,641.85 km) |
| Houston to Sovicille | 5,582.84 mi (8,984.72 km) |
