| South Milwaukee to Smolyan | 5,251.98 mi (8,452.25 km) |
| South Milwaukee to Sofia | 5,147.77 mi (8,284.54 km) |
| South Milwaukee to Sopot | 5,201.00 mi (8,370.20 km) |
| South Milwaukee to Sozopol | 5,316.13 mi (8,555.48 km) |
| South Milwaukee to Sredets | 5,302.15 mi (8,532.99 km) |
| South Milwaukee to Stamboliyski | 5,218.79 mi (8,398.83 km) |
| South Milwaukee to Stara Zagora | 5,243.63 mi (8,438.80 km) |
| South Milwaukee to Svilengrad | 5,296.42 mi (8,523.77 km) |
| South Milwaukee to Svishtov | 5,174.30 mi (8,327.23 km) |
| South Milwaukee to Targovishte | 5,235.43 mi (8,425.61 km) |
| South Milwaukee to Teteven | 5,170.68 mi (8,321.40 km) |
| South Milwaukee to Troyan | 5,188.30 mi (8,349.75 km) |
| South Milwaukee to Tryavna | 5,216.76 mi (8,395.56 km) |
| South Milwaukee to Tutrakan | 5,196.50 mi (8,362.95 km) |
| South Milwaukee to Varna | 5,282.96 mi (8,502.10 km) |
