| Herndon to Olivares | 3,765.32 mi (6,059.70 km) |
| Herndon to Olivenza | 3,681.71 mi (5,925.14 km) |
| Herndon to Olot | 4,036.93 mi (6,496.81 km) |
| Herndon to Onate | 3,785.70 mi (6,092.49 km) |
| Herndon to Onda | 3,975.46 mi (6,397.88 km) |
| Herndon to Onteniente | 3,993.96 mi (6,427.66 km) |
| Herndon to Orihuela | 4,000.41 mi (6,438.04 km) |
| Herndon to Osuna | 3,822.85 mi (6,152.27 km) |
| Herndon to Ourense | 3,547.69 mi (5,709.46 km) |
| Herndon to Oviedo | 3,617.36 mi (5,821.59 km) |
| Herndon to Paiporta | 3,984.40 mi (6,412.26 km) |
| Herndon to Pajara | 3,640.06 mi (5,858.10 km) |
| Herndon to Palafolls | 4,064.67 mi (6,541.46 km) |
| Herndon to Palafrugell | 4,076.04 mi (6,559.75 km) |
| Herndon to Palamos | 4,076.68 mi (6,560.78 km) |
