| Carbondale to Smolyan | 5,557.58 mi (8,944.06 km) |
| Carbondale to Sofia | 5,453.73 mi (8,776.93 km) |
| Carbondale to Sopot | 5,509.39 mi (8,866.51 km) |
| Carbondale to Sozopol | 5,629.24 mi (9,059.39 km) |
| Carbondale to Sredets | 5,614.22 mi (9,035.21 km) |
| Carbondale to Stamboliyski | 5,525.48 mi (8,892.40 km) |
| Carbondale to Stara Zagora | 5,553.11 mi (8,936.86 km) |
| Carbondale to Svilengrad | 5,605.26 mi (9,020.80 km) |
| Carbondale to Svishtov | 5,486.15 mi (8,829.11 km) |
| Carbondale to Targovishte | 5,548.54 mi (8,929.51 km) |
| Carbondale to Teteven | 5,478.88 mi (8,817.40 km) |
| Carbondale to Troyan | 5,497.22 mi (8,846.92 km) |
| Carbondale to Tryavna | 5,527.04 mi (8,894.91 km) |
| Carbondale to Tutrakan | 5,511.55 mi (8,869.99 km) |
| Carbondale to Varna | 5,598.30 mi (9,009.60 km) |
