| Gravesend to Olivares | 1,019.99 mi (1,641.51 km) |
| Gravesend to Olivenza | 952.53 mi (1,532.95 km) |
| Gravesend to Olot | 647.49 mi (1,042.04 km) |
| Gravesend to Onate | 595.34 mi (958.11 km) |
| Gravesend to Onda | 793.70 mi (1,277.34 km) |
| Gravesend to Onteniente | 873.18 mi (1,405.25 km) |
| Gravesend to Orihuela | 925.02 mi (1,488.67 km) |
| Gravesend to Osuna | 1,017.48 mi (1,637.48 km) |
| Gravesend to Ourense | 738.45 mi (1,188.42 km) |
| Gravesend to Oviedo | 628.92 mi (1,012.15 km) |
| Gravesend to Paiporta | 830.93 mi (1,337.25 km) |
| Gravesend to Pajara | 1,762.83 mi (2,836.99 km) |
| Gravesend to Palafolls | 684.52 mi (1,101.63 km) |
| Gravesend to Palafrugell | 671.12 mi (1,080.06 km) |
| Gravesend to Palamos | 675.67 mi (1,087.39 km) |
