| Twickenham to Sinop | 1,780.86 mi (2,866.02 km) |
| Twickenham to Siran | 2,023.22 mi (3,256.06 km) |
| Twickenham to Sirnak | 2,277.67 mi (3,665.55 km) |
| Twickenham to Sirvan | 2,235.83 mi (3,598.22 km) |
| Twickenham to Sivas | 1,951.35 mi (3,140.39 km) |
| Twickenham to Sivasli | 1,701.37 mi (2,738.10 km) |
| Twickenham to Siverek | 2,134.13 mi (3,434.55 km) |
| Twickenham to Sivrice | 2,103.78 mi (3,385.71 km) |
| Twickenham to Sivrihisar | 1,734.10 mi (2,790.77 km) |
| Twickenham to Sogut | 1,653.35 mi (2,660.81 km) |
| Twickenham to Sogutlu | 1,628.50 mi (2,620.81 km) |
| Twickenham to Soke | 1,645.07 mi (2,647.48 km) |
| Twickenham to Solhan | 2,155.91 mi (3,469.60 km) |
| Twickenham to Soma | 1,585.49 mi (2,551.60 km) |
| Twickenham to Sorgun | 1,871.34 mi (3,011.63 km) |
