| Watertown Town to Smolyan | 4,629.41 mi (7,450.31 km) |
| Watertown Town to Sofia | 4,527.09 mi (7,285.65 km) |
| Watertown Town to Sopot | 4,587.25 mi (7,382.47 km) |
| Watertown Town to Sozopol | 4,716.30 mi (7,590.16 km) |
| Watertown Town to Sredets | 4,699.06 mi (7,562.41 km) |
| Watertown Town to Stamboliyski | 4,599.74 mi (7,402.56 km) |
| Watertown Town to Stara Zagora | 4,632.87 mi (7,455.89 km) |
| Watertown Town to Svilengrad | 4,683.26 mi (7,536.98 km) |
| Watertown Town to Svishtov | 4,571.65 mi (7,357.35 km) |
| Watertown Town to Targovishte | 4,636.31 mi (7,461.42 km) |
| Watertown Town to Teteven | 4,556.59 mi (7,333.13 km) |
| Watertown Town to Troyan | 4,576.28 mi (7,364.81 km) |
| Watertown Town to Tryavna | 4,608.73 mi (7,417.03 km) |
| Watertown Town to Tutrakan | 4,604.18 mi (7,409.72 km) |
| Watertown Town to Varna | 4,690.82 mi (7,549.14 km) |
