| Sioux Falls to Orbetello | 5,012.06 mi (8,066.12 km) |
| Sioux Falls to Oria | 5,340.38 mi (8,594.51 km) |
| Sioux Falls to Oristano | 5,033.03 mi (8,099.88 km) |
| Sioux Falls to Orta Nova | 5,229.86 mi (8,416.65 km) |
| Sioux Falls to Orte | 5,054.09 mi (8,133.77 km) |
| Sioux Falls to Ortona | 5,132.32 mi (8,259.67 km) |
| Sioux Falls to Orvieto | 5,031.61 mi (8,097.59 km) |
| Sioux Falls to Orzinuovi | 4,825.98 mi (7,766.67 km) |
| Sioux Falls to Osimo | 5,044.14 mi (8,117.76 km) |
| Sioux Falls to Ospitaletto | 4,823.78 mi (7,763.12 km) |
| Sioux Falls to Ostuni | 5,326.74 mi (8,572.57 km) |
| Sioux Falls to Ottaviano | 5,209.10 mi (8,383.23 km) |
| Sioux Falls to Ovada | 4,814.52 mi (7,748.22 km) |
| Sioux Falls to Ozieri | 5,016.91 mi (8,073.94 km) |
| Sioux Falls to Paceco | 5,278.17 mi (8,494.39 km) |
