| Duluth to Olivares | 4,232.84 mi (6,812.10 km) |
| Duluth to Olivenza | 4,137.85 mi (6,659.23 km) |
| Duluth to Olot | 4,377.90 mi (7,045.55 km) |
| Duluth to Onate | 4,147.02 mi (6,673.98 km) |
| Duluth to Onda | 4,366.86 mi (7,027.78 km) |
| Duluth to Onteniente | 4,403.56 mi (7,086.85 km) |
| Duluth to Orihuela | 4,422.47 mi (7,117.27 km) |
| Duluth to Osuna | 4,285.64 mi (6,897.07 km) |
| Duluth to Ourense | 3,954.33 mi (6,363.88 km) |
| Duluth to Oviedo | 3,995.46 mi (6,430.07 km) |
| Duluth to Paiporta | 4,384.32 mi (7,055.88 km) |
| Duluth to Pajara | 4,277.27 mi (6,883.60 km) |
| Duluth to Palafolls | 4,411.10 mi (7,098.98 km) |
| Duluth to Palafrugell | 4,416.09 mi (7,107.02 km) |
| Duluth to Palamos | 4,417.98 mi (7,110.05 km) |
