| Belfast to Sierpc | 1,046.79 mi (1,684.65 km) |
| Belfast to Skarzysko-Kamienna | 1,138.09 mi (1,831.58 km) |
| Belfast to Skawina | 1,127.26 mi (1,814.16 km) |
| Belfast to Skierniewice | 1,086.05 mi (1,747.83 km) |
| Belfast to Skoczow | 1,091.39 mi (1,756.42 km) |
| Belfast to Skwierzyna | 885.88 mi (1,425.68 km) |
| Belfast to Slawno | 903.71 mi (1,454.38 km) |
| Belfast to Slubice | 853.87 mi (1,374.18 km) |
| Belfast to Slupca | 987.05 mi (1,588.50 km) |
| Belfast to Slupsk | 916.43 mi (1,474.84 km) |
| Belfast to Sochaczew | 1,083.24 mi (1,743.30 km) |
| Belfast to Sokolka | 1,189.34 mi (1,914.05 km) |
| Belfast to Sokolow Podlaski | 1,160.11 mi (1,867.02 km) |
| Belfast to Solec Kujawski | 985.68 mi (1,586.30 km) |
| Belfast to Sopot | 977.38 mi (1,572.94 km) |
