| Letchworth to Sierpc | 837.83 mi (1,348.36 km) |
| Letchworth to Skarzysko-Kamienna | 907.34 mi (1,460.22 km) |
| Letchworth to Skawina | 880.66 mi (1,417.28 km) |
| Letchworth to Skierniewice | 864.61 mi (1,391.46 km) |
| Letchworth to Skoczow | 839.93 mi (1,351.74 km) |
| Letchworth to Skwierzyna | 664.86 mi (1,069.98 km) |
| Letchworth to Slawno | 717.35 mi (1,154.46 km) |
| Letchworth to Slubice | 626.55 mi (1,008.33 km) |
| Letchworth to Slupca | 765.73 mi (1,232.32 km) |
| Letchworth to Slupsk | 732.33 mi (1,178.58 km) |
| Letchworth to Sochaczew | 865.70 mi (1,393.22 km) |
| Letchworth to Sokolka | 994.01 mi (1,599.71 km) |
| Letchworth to Sokolow Podlaski | 948.82 mi (1,526.98 km) |
| Letchworth to Solec Kujawski | 777.61 mi (1,251.45 km) |
| Letchworth to Sopot | 793.68 mi (1,277.31 km) |
