| Niagara Falls to Senftenberg | 4,096.28 mi (6,592.33 km) |
| Niagara Falls to Siegburg | 3,866.01 mi (6,221.74 km) |
| Niagara Falls to Siegen | 3,894.40 mi (6,267.44 km) |
| Niagara Falls to Sigmaringen | 4,037.56 mi (6,497.82 km) |
| Niagara Falls to Simbach am Inn | 4,179.40 mi (6,726.09 km) |
| Niagara Falls to Simmerath | 3,837.71 mi (6,176.20 km) |
| Niagara Falls to Sindelfingen | 4,006.95 mi (6,448.57 km) |
| Niagara Falls to Sinsheim | 3,983.50 mi (6,410.82 km) |
| Niagara Falls to Sinzheim | 3,972.39 mi (6,392.95 km) |
| Niagara Falls to Sinzig | 3,876.29 mi (6,238.28 km) |
| Niagara Falls to Soest | 3,875.12 mi (6,236.40 km) |
| Niagara Falls to Solingen | 3,849.41 mi (6,195.03 km) |
| Niagara Falls to Soltau | 3,892.42 mi (6,264.25 km) |
| Niagara Falls to Sommerda | 4,001.97 mi (6,440.55 km) |
| Niagara Falls to Sondershausen | 3,985.48 mi (6,414.01 km) |
