| Sun Prairie to Olivares | 4,211.50 mi (6,777.75 km) |
| Sun Prairie to Olivenza | 4,119.86 mi (6,630.28 km) |
| Sun Prairie to Olot | 4,400.45 mi (7,081.84 km) |
| Sun Prairie to Onate | 4,161.26 mi (6,696.90 km) |
| Sun Prairie to Onda | 4,372.55 mi (7,036.95 km) |
| Sun Prairie to Onteniente | 4,403.33 mi (7,086.47 km) |
| Sun Prairie to Orihuela | 4,418.10 mi (7,110.24 km) |
| Sun Prairie to Osuna | 4,266.28 mi (6,865.92 km) |
| Sun Prairie to Ourense | 3,952.02 mi (6,360.16 km) |
| Sun Prairie to Oviedo | 4,003.03 mi (6,442.25 km) |
| Sun Prairie to Paiporta | 4,387.25 mi (7,060.59 km) |
| Sun Prairie to Pajara | 4,193.10 mi (6,748.15 km) |
| Sun Prairie to Palafolls | 4,432.08 mi (7,132.74 km) |
| Sun Prairie to Palafrugell | 4,439.21 mi (7,144.21 km) |
| Sun Prairie to Palamos | 4,440.69 mi (7,146.60 km) |
