| Sioux City to Olivares | 4,554.65 mi (7,330.00 km) |
| Sioux City to Olivenza | 4,461.46 mi (7,180.03 km) |
| Sioux City to Olot | 4,721.04 mi (7,597.78 km) |
| Sioux City to Onate | 4,486.53 mi (7,220.37 km) |
| Sioux City to Onda | 4,702.74 mi (7,568.32 km) |
| Sioux City to Onteniente | 4,736.65 mi (7,622.90 km) |
| Sioux City to Orihuela | 4,753.53 mi (7,650.06 km) |
| Sioux City to Osuna | 4,608.61 mi (7,416.84 km) |
| Sioux City to Ourense | 4,286.01 mi (6,897.67 km) |
| Sioux City to Oviedo | 4,331.88 mi (6,971.48 km) |
| Sioux City to Paiporta | 4,718.91 mi (7,594.36 km) |
| Sioux City to Pajara | 4,555.39 mi (7,331.19 km) |
| Sioux City to Palafolls | 4,753.64 mi (7,650.24 km) |
| Sioux City to Palafrugell | 4,759.49 mi (7,659.65 km) |
| Sioux City to Palamos | 4,761.21 mi (7,662.43 km) |
