| Boiling Springs to Popovo | 5,388.44 mi (8,671.85 km) |
| Boiling Springs to Provadia | 5,443.25 mi (8,760.06 km) |
| Boiling Springs to Radnevo | 5,420.35 mi (8,723.21 km) |
| Boiling Springs to Radomir | 5,287.70 mi (8,509.73 km) |
| Boiling Springs to Rakitovo | 5,357.60 mi (8,622.22 km) |
| Boiling Springs to Rakovski | 5,381.36 mi (8,660.45 km) |
| Boiling Springs to Razgrad | 5,392.04 mi (8,677.65 km) |
| Boiling Springs to Razlog | 5,336.08 mi (8,587.59 km) |
| Boiling Springs to Ruse | 5,357.53 mi (8,622.12 km) |
| Boiling Springs to Samokov | 5,321.34 mi (8,563.88 km) |
| Boiling Springs to Sandanski | 5,341.17 mi (8,595.79 km) |
| Boiling Springs to Sevlievo | 5,356.89 mi (8,621.09 km) |
| Boiling Springs to Shumen | 5,419.14 mi (8,721.27 km) |
| Boiling Springs to Silistra | 5,396.76 mi (8,685.24 km) |
| Boiling Springs to Sliven | 5,420.44 mi (8,723.36 km) |
