| Tucson to Olivares | 5,612.68 mi (9,032.74 km) |
| Tucson to Olivenza | 5,520.98 mi (8,885.16 km) |
| Tucson to Olot | 5,787.88 mi (9,314.69 km) |
| Tucson to Onate | 5,553.32 mi (8,937.21 km) |
| Tucson to Onda | 5,768.69 mi (9,283.80 km) |
| Tucson to Onteniente | 5,801.53 mi (9,336.66 km) |
| Tucson to Orihuela | 5,817.42 mi (9,362.24 km) |
| Tucson to Osuna | 5,667.46 mi (9,120.89 km) |
| Tucson to Ourense | 5,350.50 mi (8,610.80 km) |
| Tucson to Oviedo | 5,398.09 mi (8,687.39 km) |
| Tucson to Paiporta | 5,784.41 mi (9,309.11 km) |
| Tucson to Pajara | 5,563.12 mi (8,952.97 km) |
| Tucson to Palafolls | 5,820.53 mi (9,367.23 km) |
| Tucson to Palafrugell | 5,826.30 mi (9,376.52 km) |
| Tucson to Palamos | 5,828.04 mi (9,379.33 km) |
