| Naperville to Popovo | 5,287.60 mi (8,509.57 km) |
| Naperville to Provadia | 5,337.80 mi (8,590.36 km) |
| Naperville to Radnevo | 5,328.88 mi (8,576.01 km) |
| Naperville to Radomir | 5,208.83 mi (8,382.80 km) |
| Naperville to Rakitovo | 5,277.63 mi (8,493.52 km) |
| Naperville to Rakovski | 5,294.74 mi (8,521.05 km) |
| Naperville to Razgrad | 5,288.45 mi (8,510.94 km) |
| Naperville to Razlog | 5,259.90 mi (8,464.99 km) |
| Naperville to Ruse | 5,254.47 mi (8,456.25 km) |
| Naperville to Samokov | 5,241.21 mi (8,434.92 km) |
| Naperville to Sandanski | 5,268.34 mi (8,478.57 km) |
| Naperville to Sevlievo | 5,263.93 mi (8,471.48 km) |
| Naperville to Shumen | 5,315.40 mi (8,554.31 km) |
| Naperville to Silistra | 5,285.22 mi (8,505.73 km) |
| Naperville to Sliven | 5,324.13 mi (8,568.35 km) |
