| South Milwaukee to Popovo | 5,218.29 mi (8,398.03 km) |
| South Milwaukee to Provadia | 5,268.09 mi (8,478.18 km) |
| South Milwaukee to Radnevo | 5,260.28 mi (8,465.61 km) |
| South Milwaukee to Radomir | 5,141.36 mi (8,274.22 km) |
| South Milwaukee to Rakitovo | 5,210.01 mi (8,384.70 km) |
| South Milwaukee to Rakovski | 5,226.56 mi (8,411.33 km) |
| South Milwaukee to Razgrad | 5,218.93 mi (8,399.05 km) |
| South Milwaukee to Razlog | 5,192.61 mi (8,356.70 km) |
| South Milwaukee to Ruse | 5,185.02 mi (8,344.48 km) |
| South Milwaukee to Samokov | 5,173.61 mi (8,326.13 km) |
| South Milwaukee to Sandanski | 5,201.32 mi (8,370.71 km) |
| South Milwaukee to Sevlievo | 5,195.27 mi (8,360.98 km) |
| South Milwaukee to Shumen | 5,245.85 mi (8,442.37 km) |
| South Milwaukee to Silistra | 5,215.08 mi (8,392.87 km) |
| South Milwaukee to Sliven | 5,255.14 mi (8,457.33 km) |
