| South Sioux City to Devnya | 5,574.99 mi (8,972.08 km) |
| South Sioux City to Dimitrovgrad | 5,575.11 mi (8,972.27 km) |
| South Sioux City to Dobrich | 5,564.28 mi (8,954.85 km) |
| South Sioux City to Dospat | 5,549.22 mi (8,930.60 km) |
| South Sioux City to Dupnitsa | 5,481.94 mi (8,822.33 km) |
| South Sioux City to Elhovo | 5,600.08 mi (9,012.45 km) |
| South Sioux City to Etropole | 5,481.29 mi (8,821.28 km) |
| South Sioux City to Gabrovo | 5,522.90 mi (8,888.25 km) |
| South Sioux City to Gorna Oryahovitsa | 5,520.47 mi (8,884.34 km) |
| South Sioux City to Gotse Delchev | 5,539.15 mi (8,914.40 km) |
| South Sioux City to Harmanli | 5,591.10 mi (8,998.00 km) |
| South Sioux City to Haskovo | 5,580.26 mi (8,980.56 km) |
| South Sioux City to Ihtiman | 5,496.08 mi (8,845.09 km) |
| South Sioux City to Isperih | 5,525.05 mi (8,891.71 km) |
| South Sioux City to Kardzhali | 5,588.85 mi (8,994.39 km) |
