| Alliance to Olivares | 3,895.98 mi (6,269.98 km) |
| Alliance to Olivenza | 3,808.92 mi (6,129.87 km) |
| Alliance to Olot | 4,136.02 mi (6,656.28 km) |
| Alliance to Onate | 3,888.60 mi (6,258.10 km) |
| Alliance to Onda | 4,087.38 mi (6,577.99 km) |
| Alliance to Onteniente | 4,110.73 mi (6,615.58 km) |
| Alliance to Orihuela | 4,120.47 mi (6,631.25 km) |
| Alliance to Osuna | 3,952.57 mi (6,361.05 km) |
| Alliance to Ourense | 3,661.04 mi (5,891.88 km) |
| Alliance to Oviedo | 3,723.62 mi (5,992.59 km) |
| Alliance to Paiporta | 4,098.59 mi (6,596.04 km) |
| Alliance to Pajara | 3,814.28 mi (6,138.49 km) |
| Alliance to Palafolls | 4,165.35 mi (6,703.49 km) |
| Alliance to Palafrugell | 4,175.12 mi (6,719.21 km) |
| Alliance to Palamos | 4,176.09 mi (6,720.76 km) |
