| Billings to Popovo | 5,683.00 mi (9,145.91 km) |
| Billings to Provadia | 5,722.84 mi (9,210.01 km) |
| Billings to Radnevo | 5,738.21 mi (9,234.76 km) |
| Billings to Radomir | 5,645.11 mi (9,084.93 km) |
| Billings to Rakitovo | 5,708.78 mi (9,187.39 km) |
| Billings to Rakovski | 5,713.90 mi (9,195.63 km) |
| Billings to Razgrad | 5,679.10 mi (9,139.64 km) |
| Billings to Razlog | 5,698.20 mi (9,170.37 km) |
| Billings to Ruse | 5,647.71 mi (9,089.10 km) |
| Billings to Samokov | 5,673.84 mi (9,131.16 km) |
| Billings to Sandanski | 5,711.79 mi (9,192.23 km) |
| Billings to Sevlievo | 5,673.90 mi (9,131.26 km) |
| Billings to Shumen | 5,704.46 mi (9,180.45 km) |
| Billings to Silistra | 5,662.34 mi (9,112.66 km) |
| Billings to Sliven | 5,725.45 mi (9,214.22 km) |
