| Huntsville to Olivares | 4,353.92 mi (7,006.96 km) |
| Huntsville to Olivenza | 4,271.01 mi (6,873.52 km) |
| Huntsville to Olot | 4,625.96 mi (7,444.77 km) |
| Huntsville to Onate | 4,375.26 mi (7,041.29 km) |
| Huntsville to Onda | 4,565.78 mi (7,347.91 km) |
| Huntsville to Onteniente | 4,584.25 mi (7,377.63 km) |
| Huntsville to Orihuela | 4,590.51 mi (7,387.71 km) |
| Huntsville to Osuna | 4,411.61 mi (7,099.80 km) |
| Huntsville to Ourense | 4,138.02 mi (6,659.50 km) |
| Huntsville to Oviedo | 4,207.28 mi (6,770.96 km) |
| Huntsville to Paiporta | 4,574.74 mi (7,362.33 km) |
| Huntsville to Pajara | 4,202.98 mi (6,764.05 km) |
| Huntsville to Palafolls | 4,653.98 mi (7,489.85 km) |
| Huntsville to Palafrugell | 4,665.08 mi (7,507.73 km) |
| Huntsville to Palamos | 4,665.78 mi (7,508.84 km) |
