| Sioux City to Karlovo | 5,515.21 mi (8,875.87 km) |
| Sioux City to Karnobat | 5,585.69 mi (8,989.31 km) |
| Sioux City to Kavarna | 5,584.46 mi (8,987.33 km) |
| Sioux City to Kazanlak | 5,535.88 mi (8,909.14 km) |
| Sioux City to Knezha | 5,446.41 mi (8,765.16 km) |
| Sioux City to Kostinbrod | 5,453.86 mi (8,777.14 km) |
| Sioux City to Kozloduy | 5,420.16 mi (8,722.91 km) |
| Sioux City to Kyustendil | 5,463.94 mi (8,793.36 km) |
| Sioux City to Levski | 5,487.37 mi (8,831.07 km) |
| Sioux City to Lom | 5,401.81 mi (8,693.37 km) |
| Sioux City to Lovech | 5,486.26 mi (8,829.28 km) |
| Sioux City to Lukovit | 5,464.93 mi (8,794.95 km) |
| Sioux City to Lyaskovets | 5,520.28 mi (8,884.03 km) |
| Sioux City to Mezdra | 5,452.31 mi (8,774.65 km) |
| Sioux City to Momchilgrad | 5,594.23 mi (9,003.05 km) |
