| Clay Cross to Smolyan | 1,447.75 mi (2,329.92 km) |
| Clay Cross to Sofia | 1,344.00 mi (2,162.96 km) |
| Clay Cross to Sopot | 1,400.95 mi (2,254.61 km) |
| Clay Cross to Sozopol | 1,526.82 mi (2,457.17 km) |
| Clay Cross to Sredets | 1,510.00 mi (2,430.12 km) |
| Clay Cross to Stamboliyski | 1,415.96 mi (2,278.76 km) |
| Clay Cross to Stara Zagora | 1,445.60 mi (2,326.46 km) |
| Clay Cross to Svilengrad | 1,497.00 mi (2,409.20 km) |
| Clay Cross to Svishtov | 1,382.31 mi (2,224.61 km) |
| Clay Cross to Targovishte | 1,446.68 mi (2,328.20 km) |
| Clay Cross to Teteven | 1,370.34 mi (2,205.34 km) |
| Clay Cross to Troyan | 1,389.29 mi (2,235.84 km) |
| Clay Cross to Tryavna | 1,420.56 mi (2,286.18 km) |
| Clay Cross to Tutrakan | 1,414.59 mi (2,276.56 km) |
| Clay Cross to Varna | 1,501.15 mi (2,415.86 km) |
