| Romanshorn to Siran | 1,556.46 mi (2,504.89 km) |
| Romanshorn to Sirnak | 1,805.28 mi (2,905.32 km) |
| Romanshorn to Sirvan | 1,765.15 mi (2,840.73 km) |
| Romanshorn to Sivas | 1,474.58 mi (2,373.10 km) |
| Romanshorn to Sivasli | 1,197.79 mi (1,927.65 km) |
| Romanshorn to Siverek | 1,653.10 mi (2,660.41 km) |
| Romanshorn to Sivrice | 1,626.56 mi (2,617.69 km) |
| Romanshorn to Sivrihisar | 1,238.89 mi (1,993.80 km) |
| Romanshorn to Sogut | 1,157.16 mi (1,862.27 km) |
| Romanshorn to Sogutlu | 1,138.04 mi (1,831.50 km) |
| Romanshorn to Soke | 1,136.10 mi (1,828.37 km) |
| Romanshorn to Solhan | 1,687.52 mi (2,715.80 km) |
| Romanshorn to Soma | 1,079.94 mi (1,737.99 km) |
| Romanshorn to Sorgun | 1,389.07 mi (2,235.49 km) |
| Romanshorn to Suhut | 1,232.67 mi (1,983.80 km) |
