| Waterville to Smolyan | 4,480.60 mi (7,210.82 km) |
| Waterville to Sofia | 4,377.87 mi (7,045.50 km) |
| Waterville to Sopot | 4,437.15 mi (7,140.91 km) |
| Waterville to Sozopol | 4,564.56 mi (7,345.95 km) |
| Waterville to Sredets | 4,547.71 mi (7,318.83 km) |
| Waterville to Stamboliyski | 4,450.38 mi (7,162.20 km) |
| Waterville to Stara Zagora | 4,482.43 mi (7,213.78 km) |
| Waterville to Svilengrad | 4,533.22 mi (7,295.51 km) |
| Waterville to Svishtov | 4,420.06 mi (7,113.40 km) |
| Waterville to Targovishte | 4,484.37 mi (7,216.89 km) |
| Waterville to Teteven | 4,406.49 mi (7,091.57 km) |
| Waterville to Troyan | 4,425.93 mi (7,122.85 km) |
| Waterville to Tryavna | 4,457.89 mi (7,174.28 km) |
| Waterville to Tutrakan | 4,451.35 mi (7,163.76 km) |
| Waterville to Varna | 4,538.09 mi (7,303.34 km) |
