| Portsmouth to Sinop | 1,808.26 mi (2,910.12 km) |
| Portsmouth to Siran | 2,050.90 mi (3,300.61 km) |
| Portsmouth to Sirnak | 2,304.40 mi (3,708.58 km) |
| Portsmouth to Sirvan | 2,262.91 mi (3,641.80 km) |
| Portsmouth to Sivas | 1,976.77 mi (3,181.30 km) |
| Portsmouth to Sivasli | 1,717.81 mi (2,764.55 km) |
| Portsmouth to Siverek | 2,158.69 mi (3,474.07 km) |
| Portsmouth to Sivrice | 2,129.25 mi (3,426.69 km) |
| Portsmouth to Sivrihisar | 1,754.11 mi (2,822.96 km) |
| Portsmouth to Sogut | 1,672.94 mi (2,692.33 km) |
| Portsmouth to Sogutlu | 1,649.94 mi (2,655.32 km) |
| Portsmouth to Soke | 1,657.59 mi (2,667.63 km) |
| Portsmouth to Solhan | 2,183.40 mi (3,513.84 km) |
| Portsmouth to Soma | 1,600.76 mi (2,576.17 km) |
| Portsmouth to Sorgun | 1,895.33 mi (3,050.23 km) |
