| Sioux Falls to Popovo | 5,477.56 mi (8,815.29 km) |
| Sioux Falls to Provadia | 5,523.73 mi (8,889.58 km) |
| Sioux Falls to Radnevo | 5,525.10 mi (8,891.80 km) |
| Sioux Falls to Radomir | 5,415.64 mi (8,715.63 km) |
| Sioux Falls to Rakitovo | 5,482.76 mi (8,823.66 km) |
| Sioux Falls to Rakovski | 5,494.89 mi (8,843.17 km) |
| Sioux Falls to Razgrad | 5,476.39 mi (8,813.40 km) |
| Sioux Falls to Razlog | 5,467.95 mi (8,799.81 km) |
| Sioux Falls to Ruse | 5,443.25 mi (8,760.07 km) |
| Sioux Falls to Samokov | 5,446.71 mi (8,765.63 km) |
| Sioux Falls to Sandanski | 5,478.64 mi (8,817.02 km) |
| Sioux Falls to Sevlievo | 5,459.93 mi (8,786.91 km) |
| Sioux Falls to Shumen | 5,502.88 mi (8,856.02 km) |
| Sioux Falls to Silistra | 5,467.35 mi (8,798.86 km) |
| Sioux Falls to Sliven | 5,516.90 mi (8,878.59 km) |
