| Oak Ridge to Smolyan | 5,450.59 mi (8,771.88 km) |
| Oak Ridge to Sofia | 5,347.70 mi (8,606.30 km) |
| Oak Ridge to Sopot | 5,406.53 mi (8,700.98 km) |
| Oak Ridge to Sozopol | 5,532.70 mi (8,904.02 km) |
| Oak Ridge to Sredets | 5,516.19 mi (8,877.45 km) |
| Oak Ridge to Stamboliyski | 5,420.16 mi (8,722.90 km) |
| Oak Ridge to Stara Zagora | 5,451.60 mi (8,773.50 km) |
| Oak Ridge to Svilengrad | 5,502.61 mi (8,855.60 km) |
| Oak Ridge to Svishtov | 5,388.38 mi (8,671.76 km) |
| Oak Ridge to Targovishte | 5,452.35 mi (8,774.71 km) |
| Oak Ridge to Teteven | 5,375.88 mi (8,651.65 km) |
| Oak Ridge to Troyan | 5,395.16 mi (8,682.68 km) |
| Oak Ridge to Tryavna | 5,426.79 mi (8,733.58 km) |
| Oak Ridge to Tutrakan | 5,418.45 mi (8,720.15 km) |
| Oak Ridge to Varna | 5,505.25 mi (8,859.85 km) |
