| Boulogne-sur-Mer to Siegburg | 244.28 mi (393.13 km) |
| Boulogne-sur-Mer to Siegen | 279.66 mi (450.07 km) |
| Boulogne-sur-Mer to Sigmaringen | 387.12 mi (623.00 km) |
| Boulogne-sur-Mer to Simbach am Inn | 538.50 mi (866.64 km) |
| Boulogne-sur-Mer to Simmerath | 205.34 mi (330.46 km) |
| Boulogne-sur-Mer to Sindelfingen | 357.94 mi (576.05 km) |
| Boulogne-sur-Mer to Sinsheim | 338.46 mi (544.70 km) |
| Boulogne-sur-Mer to Sinzheim | 322.35 mi (518.77 km) |
| Boulogne-sur-Mer to Sinzig | 247.29 mi (397.98 km) |
| Boulogne-sur-Mer to Soest | 287.37 mi (462.48 km) |
| Boulogne-sur-Mer to Solingen | 239.94 mi (386.14 km) |
| Boulogne-sur-Mer to Soltau | 383.55 mi (617.26 km) |
| Boulogne-sur-Mer to Sommerda | 414.47 mi (667.03 km) |
| Boulogne-sur-Mer to Sondershausen | 404.04 mi (650.25 km) |
| Boulogne-sur-Mer to Sonneberg | 419.97 mi (675.88 km) |
