| Buckley to Smolyan | 1,512.29 mi (2,433.79 km) |
| Buckley to Sofia | 1,408.75 mi (2,267.17 km) |
| Buckley to Sopot | 1,466.46 mi (2,360.03 km) |
| Buckley to Sozopol | 1,593.50 mi (2,564.48 km) |
| Buckley to Sredets | 1,576.43 mi (2,537.02 km) |
| Buckley to Stamboliyski | 1,480.89 mi (2,383.26 km) |
| Buckley to Stara Zagora | 1,511.38 mi (2,432.33 km) |
| Buckley to Svilengrad | 1,562.53 mi (2,514.65 km) |
| Buckley to Svishtov | 1,448.88 mi (2,331.75 km) |
| Buckley to Targovishte | 1,513.48 mi (2,435.72 km) |
| Buckley to Teteven | 1,435.82 mi (2,310.73 km) |
| Buckley to Troyan | 1,454.97 mi (2,341.55 km) |
| Buckley to Tryavna | 1,486.62 mi (2,392.48 km) |
| Buckley to Tutrakan | 1,481.95 mi (2,384.96 km) |
| Buckley to Varna | 1,568.42 mi (2,524.13 km) |
