| Sioux City to Bicaz | 5,328.74 mi (8,575.78 km) |
| Sioux City to Bistrita | 5,268.67 mi (8,479.11 km) |
| Sioux City to Blaj | 5,300.69 mi (8,530.64 km) |
| Sioux City to Bocsa | 5,271.87 mi (8,484.25 km) |
| Sioux City to Boldesti-Scaeni | 5,427.10 mi (8,734.08 km) |
| Sioux City to Bolintin Vale | 5,449.68 mi (8,770.41 km) |
| Sioux City to Borsa | 5,246.27 mi (8,443.06 km) |
| Sioux City to Botosani | 5,301.33 mi (8,531.67 km) |
| Sioux City to Brad | 5,267.64 mi (8,477.45 km) |
| Sioux City to Bragadiru | 5,460.58 mi (8,787.96 km) |
| Sioux City to Braila | 5,473.16 mi (8,808.21 km) |
| Sioux City to Brasov | 5,380.41 mi (8,658.94 km) |
| Sioux City to Breaza | 5,407.31 mi (8,702.22 km) |
| Sioux City to Bucharest | 5,461.32 mi (8,789.15 km) |
| Sioux City to Buftea | 5,449.17 mi (8,769.59 km) |
