| Echelon to Olivares | 3,624.30 mi (5,832.74 km) |
| Echelon to Olivenza | 3,540.54 mi (5,697.94 km) |
| Echelon to Olot | 3,896.14 mi (6,270.23 km) |
| Echelon to Onate | 3,644.74 mi (5,865.63 km) |
| Echelon to Onda | 3,834.18 mi (6,170.52 km) |
| Echelon to Onteniente | 3,852.63 mi (6,200.22 km) |
| Echelon to Orihuela | 3,859.10 mi (6,210.62 km) |
| Echelon to Osuna | 3,681.78 mi (5,925.25 km) |
| Echelon to Ourense | 3,406.41 mi (5,482.09 km) |
| Echelon to Oviedo | 3,476.27 mi (5,594.52 km) |
| Echelon to Paiporta | 3,843.09 mi (6,184.85 km) |
| Echelon to Pajara | 3,505.44 mi (5,641.45 km) |
| Echelon to Palafolls | 3,923.79 mi (6,314.73 km) |
| Echelon to Palafrugell | 3,935.24 mi (6,333.16 km) |
| Echelon to Palamos | 3,935.86 mi (6,334.16 km) |
