| Philadelphia to Olivares | 3,627.21 mi (5,837.43 km) |
| Philadelphia to Olivenza | 3,543.21 mi (5,702.25 km) |
| Philadelphia to Olot | 3,897.04 mi (6,271.68 km) |
| Philadelphia to Onate | 3,645.85 mi (5,867.42 km) |
| Philadelphia to Onda | 3,835.89 mi (6,173.27 km) |
| Philadelphia to Onteniente | 3,854.66 mi (6,203.48 km) |
| Philadelphia to Orihuela | 3,861.34 mi (6,214.23 km) |
| Philadelphia to Osuna | 3,684.64 mi (5,929.85 km) |
| Philadelphia to Ourense | 3,408.16 mi (5,484.90 km) |
| Philadelphia to Oviedo | 3,477.57 mi (5,596.61 km) |
| Philadelphia to Paiporta | 3,844.94 mi (6,187.84 km) |
| Philadelphia to Pajara | 3,511.43 mi (5,651.10 km) |
| Philadelphia to Palafolls | 3,924.80 mi (6,316.35 km) |
| Philadelphia to Palafrugell | 3,936.15 mi (6,334.63 km) |
| Philadelphia to Palamos | 3,936.79 mi (6,335.65 km) |
