| Knoxville to Smolyan | 5,436.45 mi (8,749.11 km) |
| Knoxville to Sofia | 5,333.62 mi (8,583.63 km) |
| Knoxville to Sopot | 5,392.59 mi (8,678.53 km) |
| Knoxville to Sozopol | 5,519.04 mi (8,882.03 km) |
| Knoxville to Sredets | 5,502.46 mi (8,855.36 km) |
| Knoxville to Stamboliyski | 5,406.09 mi (8,700.26 km) |
| Knoxville to Stara Zagora | 5,437.71 mi (8,751.15 km) |
| Knoxville to Svilengrad | 5,488.66 mi (8,833.15 km) |
| Knoxville to Svishtov | 5,374.68 mi (8,649.71 km) |
| Knoxville to Targovishte | 5,438.72 mi (8,752.77 km) |
| Knoxville to Teteven | 5,361.93 mi (8,629.20 km) |
| Knoxville to Troyan | 5,381.26 mi (8,660.30 km) |
| Knoxville to Tryavna | 5,412.97 mi (8,711.33 km) |
| Knoxville to Tutrakan | 5,404.97 mi (8,698.46 km) |
| Knoxville to Varna | 5,491.77 mi (8,838.15 km) |
