| Romanshorn to Serik | 1,326.30 mi (2,134.47 km) |
| Romanshorn to Serinhisar | 1,220.02 mi (1,963.44 km) |
| Romanshorn to Serinyol | 1,569.67 mi (2,526.15 km) |
| Romanshorn to Seydisehir | 1,336.01 mi (2,150.11 km) |
| Romanshorn to Seyhan | 1,505.62 mi (2,423.06 km) |
| Romanshorn to Seyitgazi | 1,201.94 mi (1,934.34 km) |
| Romanshorn to Siirt | 1,766.53 mi (2,842.96 km) |
| Romanshorn to Sile | 1,089.30 mi (1,753.06 km) |
| Romanshorn to Silifke | 1,470.69 mi (2,366.85 km) |
| Romanshorn to Silivri | 1,032.34 mi (1,661.39 km) |
| Romanshorn to Silopi | 1,816.13 mi (2,922.78 km) |
| Romanshorn to Simav | 1,142.61 mi (1,838.85 km) |
| Romanshorn to Sinanpasa | 1,210.82 mi (1,948.63 km) |
| Romanshorn to Sindirgi | 1,101.63 mi (1,772.91 km) |
| Romanshorn to Sinop | 1,314.33 mi (2,115.22 km) |
