| Knightdale to Smolyan | 5,219.55 mi (8,400.06 km) |
| Knightdale to Sofia | 5,117.87 mi (8,236.41 km) |
| Knightdale to Sopot | 5,179.10 mi (8,334.96 km) |
| Knightdale to Sozopol | 5,310.06 mi (8,545.72 km) |
| Knightdale to Sredets | 5,292.37 mi (8,517.25 km) |
| Knightdale to Stamboliyski | 5,190.62 mi (8,353.49 km) |
| Knightdale to Stara Zagora | 5,225.11 mi (8,409.01 km) |
| Knightdale to Svilengrad | 5,274.97 mi (8,489.25 km) |
| Knightdale to Svishtov | 5,165.30 mi (8,312.74 km) |
| Knightdale to Targovishte | 5,230.34 mi (8,417.42 km) |
| Knightdale to Teteven | 5,148.46 mi (8,285.64 km) |
| Knightdale to Troyan | 5,168.45 mi (8,317.81 km) |
| Knightdale to Tryavna | 5,201.47 mi (8,370.95 km) |
| Knightdale to Tutrakan | 5,199.20 mi (8,367.30 km) |
| Knightdale to Varna | 5,285.69 mi (8,506.49 km) |
