| Horizon West to Olivares | 4,305.33 mi (6,928.76 km) |
| Horizon West to Olivenza | 4,232.12 mi (6,810.94 km) |
| Horizon West to Olot | 4,646.39 mi (7,477.64 km) |
| Horizon West to Onate | 4,390.63 mi (7,066.04 km) |
| Horizon West to Onda | 4,557.93 mi (7,335.28 km) |
| Horizon West to Onteniente | 4,564.86 mi (7,346.42 km) |
| Horizon West to Orihuela | 4,563.32 mi (7,343.95 km) |
| Horizon West to Osuna | 4,364.26 mi (7,023.60 km) |
| Horizon West to Ourense | 4,133.59 mi (6,652.36 km) |
| Horizon West to Oviedo | 4,217.69 mi (6,787.71 km) |
| Horizon West to Paiporta | 4,561.49 mi (7,341.01 km) |
| Horizon West to Pajara | 4,043.76 mi (6,507.80 km) |
| Horizon West to Palafolls | 4,670.46 mi (7,516.39 km) |
| Horizon West to Palafrugell | 4,685.01 mi (7,539.80 km) |
| Horizon West to Palamos | 4,684.96 mi (7,539.71 km) |
