| Sioux City to Devnya | 5,572.48 mi (8,968.03 km) |
| Sioux City to Dimitrovgrad | 5,572.61 mi (8,968.26 km) |
| Sioux City to Dobrich | 5,561.77 mi (8,950.80 km) |
| Sioux City to Dospat | 5,546.73 mi (8,926.61 km) |
| Sioux City to Dupnitsa | 5,479.46 mi (8,818.34 km) |
| Sioux City to Elhovo | 5,597.57 mi (9,008.43 km) |
| Sioux City to Etropole | 5,478.80 mi (8,817.28 km) |
| Sioux City to Gabrovo | 5,520.40 mi (8,884.23 km) |
| Sioux City to Gorna Oryahovitsa | 5,517.97 mi (8,880.31 km) |
| Sioux City to Gotse Delchev | 5,536.67 mi (8,910.41 km) |
| Sioux City to Harmanli | 5,588.60 mi (8,993.99 km) |
| Sioux City to Haskovo | 5,577.77 mi (8,976.55 km) |
| Sioux City to Ihtiman | 5,493.60 mi (8,841.09 km) |
| Sioux City to Isperih | 5,522.54 mi (8,887.67 km) |
| Sioux City to Kardzhali | 5,586.36 mi (8,990.38 km) |
