| Piqua to Olivares | 4,067.31 mi (6,545.70 km) |
| Piqua to Olivenza | 3,979.94 mi (6,405.09 km) |
| Piqua to Olot | 4,302.67 mi (6,924.48 km) |
| Piqua to Onate | 4,056.10 mi (6,527.66 km) |
| Piqua to Onda | 4,256.33 mi (6,849.89 km) |
| Piqua to Onteniente | 4,280.40 mi (6,888.63 km) |
| Piqua to Orihuela | 4,290.57 mi (6,905.01 km) |
| Piqua to Osuna | 4,123.81 mi (6,636.63 km) |
| Piqua to Ourense | 3,830.37 mi (6,164.39 km) |
| Piqua to Oviedo | 3,891.79 mi (6,263.23 km) |
| Piqua to Paiporta | 4,267.88 mi (6,868.49 km) |
| Piqua to Pajara | 3,985.21 mi (6,413.58 km) |
| Piqua to Palafolls | 4,332.30 mi (6,972.16 km) |
| Piqua to Palafrugell | 4,341.75 mi (6,987.38 km) |
| Piqua to Palamos | 4,342.78 mi (6,989.03 km) |
