| National City to Olivares | 5,866.01 mi (9,440.43 km) |
| National City to Olivenza | 5,771.55 mi (9,288.41 km) |
| National City to Olot | 6,002.86 mi (9,660.67 km) |
| National City to Onate | 5,776.59 mi (9,296.52 km) |
| National City to Onda | 5,999.00 mi (9,654.45 km) |
| National City to Onteniente | 6,037.01 mi (9,715.62 km) |
| National City to Orihuela | 6,056.48 mi (9,746.97 km) |
| National City to Osuna | 5,919.19 mi (9,526.02 km) |
| National City to Ourense | 5,588.31 mi (8,993.52 km) |
| National City to Oviedo | 5,627.53 mi (9,056.63 km) |
| National City to Paiporta | 6,017.14 mi (9,683.65 km) |
| National City to Pajara | 5,862.99 mi (9,435.57 km) |
| National City to Palafolls | 6,036.85 mi (9,715.38 km) |
| National City to Palafrugell | 6,040.62 mi (9,721.44 km) |
| National City to Palamos | 6,042.73 mi (9,724.84 km) |
