| Flensburg to Siegburg | 290.37 mi (467.31 km) |
| Flensburg to Siegen | 275.80 mi (443.85 km) |
| Flensburg to Sigmaringen | 462.69 mi (744.63 km) |
| Flensburg to Simbach am Inn | 475.58 mi (765.37 km) |
| Flensburg to Simmerath | 317.33 mi (510.69 km) |
| Flensburg to Sindelfingen | 419.71 mi (675.45 km) |
| Flensburg to Sinsheim | 382.94 mi (616.28 km) |
| Flensburg to Sinzheim | 419.45 mi (675.04 km) |
| Flensburg to Sinzig | 306.66 mi (493.53 km) |
| Flensburg to Soest | 228.54 mi (367.80 km) |
| Flensburg to Solingen | 268.25 mi (431.71 km) |
| Flensburg to Soltau | 125.32 mi (201.68 km) |
| Flensburg to Sommerda | 259.70 mi (417.94 km) |
| Flensburg to Sondershausen | 243.31 mi (391.56 km) |
| Flensburg to Sonneberg | 314.69 mi (506.45 km) |
