| Niagara Falls to Sierpc | 4,244.30 mi (6,830.55 km) |
| Niagara Falls to Skarzysko-Kamienna | 4,358.44 mi (7,014.23 km) |
| Niagara Falls to Skawina | 4,366.21 mi (7,026.73 km) |
| Niagara Falls to Skierniewice | 4,297.35 mi (6,915.92 km) |
| Niagara Falls to Skoczow | 4,335.86 mi (6,977.89 km) |
| Niagara Falls to Skwierzyna | 4,109.81 mi (6,614.09 km) |
| Niagara Falls to Slawno | 4,085.86 mi (6,575.55 km) |
| Niagara Falls to Slubice | 4,085.71 mi (6,575.32 km) |
| Niagara Falls to Slupca | 4,204.60 mi (6,766.66 km) |
| Niagara Falls to Slupsk | 4,093.94 mi (6,588.56 km) |
| Niagara Falls to Sochaczew | 4,289.57 mi (6,903.40 km) |
| Niagara Falls to Sokolka | 4,352.32 mi (7,004.38 km) |
| Niagara Falls to Sokolow Podlaski | 4,351.80 mi (7,003.54 km) |
| Niagara Falls to Solec Kujawski | 4,187.24 mi (6,738.70 km) |
| Niagara Falls to Sopot | 4,146.43 mi (6,673.03 km) |
