| Mount Prospect to Popovo | 5,263.62 mi (8,470.97 km) |
| Mount Prospect to Provadia | 5,313.76 mi (8,551.68 km) |
| Mount Prospect to Radnevo | 5,305.00 mi (8,537.58 km) |
| Mount Prospect to Radomir | 5,185.12 mi (8,344.65 km) |
| Mount Prospect to Rakitovo | 5,253.90 mi (8,455.33 km) |
| Mount Prospect to Rakovski | 5,270.92 mi (8,482.73 km) |
| Mount Prospect to Razgrad | 5,264.44 mi (8,472.29 km) |
| Mount Prospect to Razlog | 5,236.22 mi (8,426.88 km) |
| Mount Prospect to Ruse | 5,230.47 mi (8,417.62 km) |
| Mount Prospect to Samokov | 5,217.49 mi (8,396.73 km) |
| Mount Prospect to Sandanski | 5,244.70 mi (8,440.53 km) |
| Mount Prospect to Sevlievo | 5,240.05 mi (8,433.04 km) |
| Mount Prospect to Shumen | 5,291.38 mi (8,515.66 km) |
| Mount Prospect to Silistra | 5,261.12 mi (8,466.95 km) |
| Mount Prospect to Sliven | 5,300.19 mi (8,529.83 km) |
