| Westbrook to Sinop | 4,933.44 mi (7,939.61 km) |
| Westbrook to Siran | 5,170.57 mi (8,321.23 km) |
| Westbrook to Sirnak | 5,427.75 mi (8,735.12 km) |
| Westbrook to Sirvan | 5,384.23 mi (8,665.08 km) |
| Westbrook to Sivas | 5,112.32 mi (8,227.49 km) |
| Westbrook to Sivasli | 4,881.82 mi (7,856.53 km) |
| Westbrook to Siverek | 5,297.63 mi (8,525.72 km) |
| Westbrook to Sivrice | 5,263.08 mi (8,470.12 km) |
| Westbrook to Sivrihisar | 4,912.57 mi (7,906.02 km) |
| Westbrook to Sogut | 4,832.47 mi (7,777.12 km) |
| Westbrook to Sogutlu | 4,804.73 mi (7,732.46 km) |
| Westbrook to Soke | 4,820.97 mi (7,758.61 km) |
| Westbrook to Solhan | 5,302.64 mi (8,533.77 km) |
| Westbrook to Soma | 4,765.27 mi (7,668.95 km) |
| Westbrook to Sorgun | 5,039.11 mi (8,109.66 km) |
