| Webster Groves to Smolyan | 5,556.77 mi (8,942.76 km) |
| Webster Groves to Sofia | 5,452.73 mi (8,775.32 km) |
| Webster Groves to Sopot | 5,507.37 mi (8,863.25 km) |
| Webster Groves to Sozopol | 5,625.17 mi (9,052.84 km) |
| Webster Groves to Sredets | 5,610.61 mi (9,029.41 km) |
| Webster Groves to Stamboliyski | 5,524.19 mi (8,890.33 km) |
| Webster Groves to Stara Zagora | 5,550.63 mi (8,932.87 km) |
| Webster Groves to Svilengrad | 5,603.08 mi (9,017.28 km) |
| Webster Groves to Svishtov | 5,482.60 mi (8,823.40 km) |
| Webster Groves to Targovishte | 5,544.45 mi (8,922.93 km) |
| Webster Groves to Teteven | 5,476.93 mi (8,814.26 km) |
| Webster Groves to Troyan | 5,494.96 mi (8,843.29 km) |
| Webster Groves to Tryavna | 5,524.20 mi (8,890.34 km) |
| Webster Groves to Tutrakan | 5,506.57 mi (8,861.97 km) |
| Webster Groves to Varna | 5,593.21 mi (9,001.41 km) |
