| Buckingham to Smolyan | 1,401.06 mi (2,254.79 km) |
| Buckingham to Sofia | 1,298.00 mi (2,088.93 km) |
| Buckingham to Sopot | 1,357.20 mi (2,184.20 km) |
| Buckingham to Sozopol | 1,487.13 mi (2,393.31 km) |
| Buckingham to Sredets | 1,469.36 mi (2,364.71 km) |
| Buckingham to Stamboliyski | 1,370.43 mi (2,205.50 km) |
| Buckingham to Stara Zagora | 1,402.72 mi (2,257.46 km) |
| Buckingham to Svilengrad | 1,453.24 mi (2,338.77 km) |
| Buckingham to Svishtov | 1,342.35 mi (2,160.30 km) |
| Buckingham to Targovishte | 1,407.59 mi (2,265.29 km) |
| Buckingham to Teteven | 1,326.54 mi (2,134.86 km) |
| Buckingham to Troyan | 1,346.14 mi (2,166.40 km) |
| Buckingham to Tryavna | 1,378.65 mi (2,218.72 km) |
| Buckingham to Tutrakan | 1,377.94 mi (2,217.58 km) |
| Buckingham to Varna | 1,464.01 mi (2,356.10 km) |
