| Horizon City to Olivares | 5,416.17 mi (8,716.48 km) |
| Horizon City to Olivenza | 5,326.81 mi (8,572.68 km) |
| Horizon City to Olot | 5,619.59 mi (9,043.85 km) |
| Horizon City to Onate | 5,379.65 mi (8,657.70 km) |
| Horizon City to Onda | 5,588.96 mi (8,994.56 km) |
| Horizon City to Onteniente | 5,617.82 mi (9,041.01 km) |
| Horizon City to Orihuela | 5,630.98 mi (9,062.19 km) |
| Horizon City to Osuna | 5,471.98 mi (8,806.30 km) |
| Horizon City to Ourense | 5,166.52 mi (8,314.71 km) |
| Horizon City to Oviedo | 5,220.29 mi (8,401.25 km) |
| Horizon City to Paiporta | 5,602.82 mi (9,016.87 km) |
| Horizon City to Pajara | 5,331.91 mi (8,580.87 km) |
| Horizon City to Palafolls | 5,651.11 mi (9,094.58 km) |
| Horizon City to Palafrugell | 5,658.36 mi (9,106.25 km) |
| Horizon City to Palamos | 5,659.83 mi (9,108.61 km) |
