| Clayton to Smolyan | 1,479.86 mi (2,381.60 km) |
| Clayton to Sofia | 1,375.89 mi (2,214.27 km) |
| Clayton to Sopot | 1,431.73 mi (2,304.14 km) |
| Clayton to Sozopol | 1,555.54 mi (2,503.40 km) |
| Clayton to Sredets | 1,539.20 mi (2,477.11 km) |
| Clayton to Stamboliyski | 1,447.55 mi (2,329.61 km) |
| Clayton to Stara Zagora | 1,475.92 mi (2,375.26 km) |
| Clayton to Svilengrad | 1,527.70 mi (2,458.60 km) |
| Clayton to Svishtov | 1,411.30 mi (2,271.27 km) |
| Clayton to Targovishte | 1,475.19 mi (2,374.09 km) |
| Clayton to Teteven | 1,401.17 mi (2,254.96 km) |
| Clayton to Troyan | 1,419.79 mi (2,284.93 km) |
| Clayton to Tryavna | 1,450.45 mi (2,334.28 km) |
| Clayton to Tutrakan | 1,441.96 mi (2,320.60 km) |
| Clayton to Varna | 1,528.66 mi (2,460.15 km) |
