| Caldwell to Smolyan | 6,078.57 mi (9,782.51 km) |
| Caldwell to Sofia | 5,977.80 mi (9,620.34 km) |
| Caldwell to Sopot | 6,013.98 mi (9,678.57 km) |
| Caldwell to Sozopol | 6,094.11 mi (9,807.53 km) |
| Caldwell to Sredets | 6,087.46 mi (9,796.81 km) |
| Caldwell to Stamboliyski | 6,040.80 mi (9,721.73 km) |
| Caldwell to Stara Zagora | 6,047.87 mi (9,733.11 km) |
| Caldwell to Svilengrad | 6,101.64 mi (9,819.64 km) |
| Caldwell to Svishtov | 5,967.89 mi (9,604.40 km) |
| Caldwell to Targovishte | 6,017.87 mi (9,684.83 km) |
| Caldwell to Teteven | 5,986.43 mi (9,634.23 km) |
| Caldwell to Troyan | 5,998.84 mi (9,654.20 km) |
| Caldwell to Tryavna | 6,017.64 mi (9,684.46 km) |
| Caldwell to Tutrakan | 5,968.79 mi (9,605.83 km) |
| Caldwell to Varna | 6,048.59 mi (9,734.27 km) |
