| Gelsenkirchen to Olivenza | 1,120.84 mi (1,803.81 km) |
| Gelsenkirchen to Olot | 680.41 mi (1,095.02 km) |
| Gelsenkirchen to Onate | 735.33 mi (1,183.39 km) |
| Gelsenkirchen to Onda | 872.66 mi (1,404.41 km) |
| Gelsenkirchen to Onteniente | 952.80 mi (1,533.38 km) |
| Gelsenkirchen to Orihuela | 1,006.90 mi (1,620.46 km) |
| Gelsenkirchen to Osuna | 1,152.82 mi (1,855.28 km) |
| Gelsenkirchen to Ourense | 945.84 mi (1,522.18 km) |
| Gelsenkirchen to Oviedo | 824.58 mi (1,327.03 km) |
| Gelsenkirchen to Paiporta | 910.08 mi (1,464.63 km) |
| Gelsenkirchen to Pajara | 1,940.06 mi (3,122.22 km) |
| Gelsenkirchen to Palafolls | 710.71 mi (1,143.78 km) |
| Gelsenkirchen to Palafrugell | 688.70 mi (1,108.36 km) |
| Gelsenkirchen to Palamos | 693.93 mi (1,116.78 km) |
| Gelsenkirchen to Palencia | 854.61 mi (1,375.36 km) |
