| Smolyan to Siegburg | 1,047.19 mi (1,685.29 km) |
| Smolyan to Siegen | 1,019.98 mi (1,641.49 km) |
| Smolyan to Sigmaringen | 879.35 mi (1,415.18 km) |
| Smolyan to Simbach am Inn | 733.39 mi (1,180.28 km) |
| Smolyan to Simmerath | 1,074.80 mi (1,729.73 km) |
| Smolyan to Sindelfingen | 907.14 mi (1,459.90 km) |
| Smolyan to Sinsheim | 929.28 mi (1,495.53 km) |
| Smolyan to Sinzheim | 942.78 mi (1,517.26 km) |
| Smolyan to Sinzig | 1,036.46 mi (1,668.03 km) |
| Smolyan to Soest | 1,043.05 mi (1,678.62 km) |
| Smolyan to Solingen | 1,064.75 mi (1,713.54 km) |
| Smolyan to Soltau | 1,047.49 mi (1,685.78 km) |
| Smolyan to Sommerda | 923.06 mi (1,485.53 km) |
| Smolyan to Sondershausen | 940.49 mi (1,513.57 km) |
| Smolyan to Sonneberg | 885.91 mi (1,425.73 km) |
