| Southend to Sinop | 1,737.23 mi (2,795.81 km) |
| Southend to Siran | 1,979.49 mi (3,185.67 km) |
| Southend to Sirnak | 2,234.17 mi (3,595.55 km) |
| Southend to Sirvan | 2,192.24 mi (3,528.07 km) |
| Southend to Sivas | 1,908.28 mi (3,071.08 km) |
| Southend to Sivasli | 1,661.73 mi (2,674.29 km) |
| Southend to Siverek | 2,091.31 mi (3,365.65 km) |
| Southend to Sivrice | 2,060.68 mi (3,316.34 km) |
| Southend to Sivrihisar | 1,692.98 mi (2,724.58 km) |
| Southend to Sogut | 1,612.41 mi (2,594.92 km) |
| Southend to Sogutlu | 1,586.85 mi (2,553.79 km) |
| Southend to Soke | 1,607.23 mi (2,586.59 km) |
| Southend to Solhan | 2,112.21 mi (3,399.28 km) |
| Southend to Soma | 1,546.40 mi (2,488.69 km) |
| Southend to Sorgun | 1,828.75 mi (2,943.09 km) |
