| Howard to Olivares | 4,119.43 mi (6,629.58 km) |
| Howard to Olivenza | 4,027.00 mi (6,480.83 km) |
| Howard to Olot | 4,299.87 mi (6,919.97 km) |
| Howard to Onate | 4,062.01 mi (6,537.17 km) |
| Howard to Onda | 4,274.99 mi (6,879.94 km) |
| Howard to Onteniente | 4,306.93 mi (6,931.33 km) |
| Howard to Orihuela | 4,322.53 mi (6,956.45 km) |
| Howard to Osuna | 4,173.81 mi (6,717.09 km) |
| Howard to Ourense | 3,855.78 mi (6,205.29 km) |
| Howard to Oviedo | 3,904.92 mi (6,284.35 km) |
| Howard to Paiporta | 4,290.22 mi (6,904.45 km) |
| Howard to Pajara | 4,117.51 mi (6,626.49 km) |
| Howard to Palafolls | 4,331.78 mi (6,971.32 km) |
| Howard to Palafrugell | 4,338.54 mi (6,982.21 km) |
| Howard to Palamos | 4,340.10 mi (6,984.71 km) |
