| Piraeus to Olivenza | 1,659.84 mi (2,671.25 km) |
| Piraeus to Olot | 1,153.19 mi (1,855.89 km) |
| Piraeus to Onate | 1,407.76 mi (2,265.58 km) |
| Piraeus to Onda | 1,288.42 mi (2,073.51 km) |
| Piraeus to Onteniente | 1,311.18 mi (2,110.14 km) |
| Piraeus to Orihuela | 1,334.88 mi (2,148.27 km) |
| Piraeus to Osuna | 1,568.42 mi (2,524.12 km) |
| Piraeus to Ourense | 1,681.85 mi (2,706.67 km) |
| Piraeus to Oviedo | 1,581.69 mi (2,545.48 km) |
| Piraeus to Paiporta | 1,298.11 mi (2,089.11 km) |
| Piraeus to Pajara | 2,264.77 mi (3,644.80 km) |
| Piraeus to Palafolls | 1,135.57 mi (1,827.53 km) |
| Piraeus to Palafrugell | 1,116.51 mi (1,796.84 km) |
| Piraeus to Palamos | 1,117.62 mi (1,798.64 km) |
| Piraeus to Palencia | 1,511.15 mi (2,431.96 km) |
