| Knoxville to Popovo | 5,420.72 mi (8,723.80 km) |
| Knoxville to Provadia | 5,474.61 mi (8,810.54 km) |
| Knoxville to Radnevo | 5,454.74 mi (8,778.56 km) |
| Knoxville to Radomir | 5,324.59 mi (8,569.10 km) |
| Knoxville to Rakitovo | 5,394.38 mi (8,681.42 km) |
| Knoxville to Rakovski | 5,416.74 mi (8,717.40 km) |
| Knoxville to Razgrad | 5,423.72 mi (8,728.64 km) |
| Knoxville to Razlog | 5,373.65 mi (8,648.05 km) |
| Knoxville to Ruse | 5,389.27 mi (8,673.19 km) |
| Knoxville to Samokov | 5,358.03 mi (8,622.91 km) |
| Knoxville to Sandanski | 5,379.47 mi (8,657.42 km) |
| Knoxville to Sevlievo | 5,390.85 mi (8,675.73 km) |
| Knoxville to Shumen | 5,450.84 mi (8,772.29 km) |
| Knoxville to Silistra | 5,426.69 mi (8,733.41 km) |
| Knoxville to Sliven | 5,453.78 mi (8,777.00 km) |
