| Radford to Smolyan | 5,244.22 mi (8,439.76 km) |
| Radford to Sofia | 5,141.73 mi (8,274.81 km) |
| Radford to Sopot | 5,201.47 mi (8,370.95 km) |
| Radford to Sozopol | 5,329.48 mi (8,576.97 km) |
| Radford to Sredets | 5,312.52 mi (8,549.67 km) |
| Radford to Stamboliyski | 5,214.32 mi (8,391.63 km) |
| Radford to Stara Zagora | 5,246.90 mi (8,444.07 km) |
| Radford to Svilengrad | 5,297.51 mi (8,525.51 km) |
| Radford to Svishtov | 5,184.93 mi (8,344.34 km) |
| Radford to Targovishte | 5,249.34 mi (8,447.99 km) |
| Radford to Teteven | 5,170.80 mi (8,321.60 km) |
| Radford to Troyan | 5,190.35 mi (8,353.07 km) |
| Radford to Tryavna | 5,222.52 mi (8,404.83 km) |
| Radford to Tutrakan | 5,216.48 mi (8,395.12 km) |
| Radford to Varna | 5,303.20 mi (8,534.68 km) |
