| Pittsburg to Olivares | 5,812.19 mi (9,353.82 km) |
| Pittsburg to Olivenza | 5,713.99 mi (9,195.77 km) |
| Pittsburg to Olot | 5,885.93 mi (9,472.49 km) |
| Pittsburg to Onate | 5,674.65 mi (9,132.46 km) |
| Pittsburg to Onda | 5,905.73 mi (9,504.35 km) |
| Pittsburg to Onteniente | 5,951.59 mi (9,578.17 km) |
| Pittsburg to Orihuela | 5,976.68 mi (9,618.54 km) |
| Pittsburg to Osuna | 5,862.06 mi (9,434.08 km) |
| Pittsburg to Ourense | 5,511.44 mi (8,869.81 km) |
| Pittsburg to Oviedo | 5,536.83 mi (8,910.67 km) |
| Pittsburg to Paiporta | 5,927.52 mi (9,539.42 km) |
| Pittsburg to Pajara | 5,899.12 mi (9,493.72 km) |
| Pittsburg to Palafolls | 5,921.59 mi (9,529.88 km) |
| Pittsburg to Palafrugell | 5,922.31 mi (9,531.03 km) |
| Pittsburg to Palamos | 5,924.94 mi (9,535.27 km) |
