| Irthlingborough to Sierpc | 849.07 mi (1,366.44 km) |
| Irthlingborough to Skarzysko-Kamienna | 921.91 mi (1,483.67 km) |
| Irthlingborough to Skawina | 897.62 mi (1,444.58 km) |
| Irthlingborough to Skierniewice | 877.71 mi (1,412.54 km) |
| Irthlingborough to Skoczow | 857.60 mi (1,380.17 km) |
| Irthlingborough to Skwierzyna | 677.22 mi (1,089.88 km) |
| Irthlingborough to Slawno | 724.98 mi (1,166.74 km) |
| Irthlingborough to Slubice | 639.71 mi (1,029.51 km) |
| Irthlingborough to Slupca | 778.52 mi (1,252.90 km) |
| Irthlingborough to Slupsk | 739.73 mi (1,190.48 km) |
| Irthlingborough to Sochaczew | 878.24 mi (1,413.39 km) |
| Irthlingborough to Sokolka | 1,003.82 mi (1,615.49 km) |
| Irthlingborough to Sokolow Podlaski | 960.69 mi (1,546.08 km) |
| Irthlingborough to Solec Kujawski | 788.52 mi (1,269.00 km) |
| Irthlingborough to Sopot | 801.30 mi (1,289.56 km) |
