| Allentown to Olivares | 3,629.68 mi (5,841.40 km) |
| Allentown to Olivenza | 3,544.87 mi (5,704.91 km) |
| Allentown to Olot | 3,892.65 mi (6,264.61 km) |
| Allentown to Onate | 3,642.17 mi (5,861.51 km) |
| Allentown to Onda | 3,834.22 mi (6,170.58 km) |
| Allentown to Onteniente | 3,854.05 mi (6,202.50 km) |
| Allentown to Orihuela | 3,861.47 mi (6,214.43 km) |
| Allentown to Osuna | 3,686.91 mi (5,933.50 km) |
| Allentown to Ourense | 3,406.66 mi (5,482.49 km) |
| Allentown to Oviedo | 3,474.56 mi (5,591.76 km) |
| Allentown to Paiporta | 3,843.77 mi (6,185.95 km) |
| Allentown to Pajara | 3,524.71 mi (5,672.47 km) |
| Allentown to Palafolls | 3,920.75 mi (6,309.83 km) |
| Allentown to Palafrugell | 3,931.77 mi (6,327.57 km) |
| Allentown to Palamos | 3,932.48 mi (6,328.71 km) |
