| Duncan to Olivares | 4,911.00 mi (7,903.49 km) |
| Duncan to Olivenza | 4,823.17 mi (7,762.15 km) |
| Duncan to Olot | 5,134.32 mi (8,262.89 km) |
| Duncan to Onate | 4,890.54 mi (7,870.56 km) |
| Duncan to Onda | 5,094.75 mi (8,199.21 km) |
| Duncan to Onteniente | 5,120.69 mi (8,240.95 km) |
| Duncan to Orihuela | 5,131.93 mi (8,259.04 km) |
| Duncan to Osuna | 4,967.37 mi (7,994.20 km) |
| Duncan to Ourense | 4,669.98 mi (7,515.60 km) |
| Duncan to Oviedo | 4,728.27 mi (7,609.42 km) |
| Duncan to Paiporta | 5,107.23 mi (8,219.29 km) |
| Duncan to Pajara | 4,814.43 mi (7,748.07 km) |
| Duncan to Palafolls | 5,164.84 mi (8,312.00 km) |
| Duncan to Palafrugell | 5,173.29 mi (8,325.61 km) |
| Duncan to Palamos | 5,174.53 mi (8,327.59 km) |
