| Williamsport to Olivares | 3,690.22 mi (5,938.83 km) |
| Williamsport to Olivenza | 3,604.16 mi (5,800.33 km) |
| Williamsport to Olot | 3,941.57 mi (6,343.34 km) |
| Williamsport to Onate | 3,692.48 mi (5,942.47 km) |
| Williamsport to Onda | 3,887.90 mi (6,256.96 km) |
| Williamsport to Onteniente | 3,909.52 mi (6,291.77 km) |
| Williamsport to Orihuela | 3,918.14 mi (6,305.63 km) |
| Williamsport to Osuna | 3,747.11 mi (6,030.39 km) |
| Williamsport to Ourense | 3,460.84 mi (5,569.68 km) |
| Williamsport to Oviedo | 3,526.09 mi (5,674.70 km) |
| Williamsport to Paiporta | 3,898.29 mi (6,273.69 km) |
| Williamsport to Pajara | 3,600.61 mi (5,794.62 km) |
| Williamsport to Palafolls | 3,970.26 mi (6,389.52 km) |
| Williamsport to Palafrugell | 3,980.69 mi (6,406.31 km) |
| Williamsport to Palamos | 3,981.52 mi (6,407.64 km) |
