| Waterbury to Smolyan | 4,739.50 mi (7,627.48 km) |
| Waterbury to Sofia | 4,637.12 mi (7,462.72 km) |
| Waterbury to Sopot | 4,697.13 mi (7,559.30 km) |
| Waterbury to Sozopol | 4,825.86 mi (7,766.47 km) |
| Waterbury to Sredets | 4,808.70 mi (7,738.85 km) |
| Waterbury to Stamboliyski | 4,709.74 mi (7,579.59 km) |
| Waterbury to Stara Zagora | 4,742.69 mi (7,632.62 km) |
| Waterbury to Svilengrad | 4,793.15 mi (7,713.82 km) |
| Waterbury to Svishtov | 4,681.23 mi (7,533.71 km) |
| Waterbury to Targovishte | 4,745.82 mi (7,637.65 km) |
| Waterbury to Teteven | 4,666.47 mi (7,509.95 km) |
| Waterbury to Troyan | 4,686.11 mi (7,541.56 km) |
| Waterbury to Tryavna | 4,718.47 mi (7,593.64 km) |
| Waterbury to Tutrakan | 4,713.48 mi (7,585.61 km) |
| Waterbury to Varna | 4,800.14 mi (7,725.08 km) |
