| Portchester to Sinop | 1,809.92 mi (2,912.79 km) |
| Portchester to Siran | 2,052.55 mi (3,303.26 km) |
| Portchester to Sirnak | 2,306.10 mi (3,711.32 km) |
| Portchester to Sirvan | 2,264.59 mi (3,644.50 km) |
| Portchester to Sivas | 1,978.52 mi (3,184.13 km) |
| Portchester to Sivasli | 1,719.93 mi (2,767.97 km) |
| Portchester to Siverek | 2,160.49 mi (3,476.97 km) |
| Portchester to Sivrice | 2,131.00 mi (3,429.52 km) |
| Portchester to Sivrihisar | 1,756.10 mi (2,826.17 km) |
| Portchester to Sogut | 1,674.94 mi (2,695.56 km) |
| Portchester to Sogutlu | 1,651.87 mi (2,658.42 km) |
| Portchester to Soke | 1,659.85 mi (2,671.27 km) |
| Portchester to Solhan | 2,185.06 mi (3,516.51 km) |
| Portchester to Soma | 1,602.92 mi (2,579.65 km) |
| Portchester to Sorgun | 1,897.15 mi (3,053.16 km) |
