| Sun Prairie to Popovo | 5,251.84 mi (8,452.02 km) |
| Sun Prairie to Provadia | 5,301.04 mi (8,531.20 km) |
| Sun Prairie to Radnevo | 5,294.83 mi (8,521.21 km) |
| Sun Prairie to Radomir | 5,177.50 mi (8,332.38 km) |
| Sun Prairie to Rakitovo | 5,245.92 mi (8,442.50 km) |
| Sun Prairie to Rakovski | 5,261.70 mi (8,467.89 km) |
| Sun Prairie to Razgrad | 5,252.16 mi (8,452.54 km) |
| Sun Prairie to Razlog | 5,228.97 mi (8,415.21 km) |
| Sun Prairie to Ruse | 5,218.37 mi (8,398.15 km) |
| Sun Prairie to Samokov | 5,209.56 mi (8,383.98 km) |
| Sun Prairie to Sandanski | 5,238.03 mi (8,429.80 km) |
| Sun Prairie to Sevlievo | 5,229.75 mi (8,416.47 km) |
| Sun Prairie to Shumen | 5,279.02 mi (8,495.77 km) |
| Sun Prairie to Silistra | 5,247.41 mi (8,444.89 km) |
| Sun Prairie to Sliven | 5,289.15 mi (8,512.07 km) |
