| Clifton to Smolyan | 1,431.75 mi (2,304.18 km) |
| Clifton to Sofia | 1,328.12 mi (2,137.39 km) |
| Clifton to Sopot | 1,385.50 mi (2,229.74 km) |
| Clifton to Sozopol | 1,512.17 mi (2,433.60 km) |
| Clifton to Sredets | 1,495.17 mi (2,406.24 km) |
| Clifton to Stamboliyski | 1,400.17 mi (2,253.36 km) |
| Clifton to Stara Zagora | 1,430.32 mi (2,301.87 km) |
| Clifton to Svilengrad | 1,481.57 mi (2,384.35 km) |
| Clifton to Svishtov | 1,367.57 mi (2,200.90 km) |
| Clifton to Targovishte | 1,432.13 mi (2,304.79 km) |
| Clifton to Teteven | 1,354.87 mi (2,180.45 km) |
| Clifton to Troyan | 1,373.94 mi (2,211.15 km) |
| Clifton to Tryavna | 1,405.46 mi (2,261.87 km) |
| Clifton to Tutrakan | 1,400.51 mi (2,253.91 km) |
| Clifton to Varna | 1,486.99 mi (2,393.09 km) |
