| Clarkston to Smolyan | 5,551.73 mi (8,934.65 km) |
| Clarkston to Sofia | 5,449.37 mi (8,769.91 km) |
| Clarkston to Sopot | 5,509.34 mi (8,866.43 km) |
| Clarkston to Sozopol | 5,637.72 mi (9,073.04 km) |
| Clarkston to Sredets | 5,620.68 mi (9,045.61 km) |
| Clarkston to Stamboliyski | 5,521.99 mi (8,886.78 km) |
| Clarkston to Stara Zagora | 5,554.86 mi (8,939.68 km) |
| Clarkston to Svilengrad | 5,605.36 mi (9,020.96 km) |
| Clarkston to Svishtov | 5,493.14 mi (8,840.36 km) |
| Clarkston to Targovishte | 5,557.61 mi (8,944.11 km) |
| Clarkston to Teteven | 5,478.68 mi (8,817.08 km) |
| Clarkston to Troyan | 5,498.29 mi (8,848.65 km) |
| Clarkston to Tryavna | 5,530.57 mi (8,900.59 km) |
| Clarkston to Tutrakan | 5,524.90 mi (8,891.47 km) |
| Clarkston to Varna | 5,611.61 mi (9,031.01 km) |
