| Casselberry to Smolyan | 5,673.55 mi (9,130.69 km) |
| Casselberry to Sofia | 5,573.58 mi (8,969.80 km) |
| Casselberry to Sopot | 5,637.13 mi (9,072.09 km) |
| Casselberry to Sozopol | 5,772.50 mi (9,289.94 km) |
| Casselberry to Sredets | 5,753.68 mi (9,259.66 km) |
| Casselberry to Stamboliyski | 5,646.36 mi (9,086.93 km) |
| Casselberry to Stara Zagora | 5,683.95 mi (9,147.44 km) |
| Casselberry to Svilengrad | 5,732.41 mi (9,225.42 km) |
| Casselberry to Svishtov | 5,627.82 mi (9,057.11 km) |
| Casselberry to Targovishte | 5,693.69 mi (9,163.10 km) |
| Casselberry to Teteven | 5,606.61 mi (9,022.97 km) |
| Casselberry to Troyan | 5,627.27 mi (9,056.21 km) |
| Casselberry to Tryavna | 5,661.60 mi (9,111.46 km) |
| Casselberry to Tutrakan | 5,665.33 mi (9,117.47 km) |
| Casselberry to Varna | 5,751.21 mi (9,255.68 km) |
