| Knottingley to Smolyan | 1,456.64 mi (2,344.23 km) |
| Knottingley to Sofia | 1,352.64 mi (2,176.86 km) |
| Knottingley to Sopot | 1,408.34 mi (2,266.51 km) |
| Knottingley to Sozopol | 1,531.98 mi (2,465.48 km) |
| Knottingley to Sredets | 1,515.67 mi (2,439.24 km) |
| Knottingley to Stamboliyski | 1,424.26 mi (2,292.13 km) |
| Knottingley to Stara Zagora | 1,452.49 mi (2,337.55 km) |
| Knottingley to Svilengrad | 1,504.31 mi (2,420.95 km) |
| Knottingley to Svishtov | 1,387.76 mi (2,233.39 km) |
| Knottingley to Targovishte | 1,451.62 mi (2,336.15 km) |
| Knottingley to Teteven | 1,377.79 mi (2,217.34 km) |
| Knottingley to Troyan | 1,396.37 mi (2,247.25 km) |
| Knottingley to Tryavna | 1,426.98 mi (2,296.50 km) |
| Knottingley to Tutrakan | 1,418.33 mi (2,282.58 km) |
| Knottingley to Varna | 1,505.04 mi (2,422.13 km) |
