| Gelsenkirchen to Oria | 911.71 mi (1,467.25 km) |
| Gelsenkirchen to Oristano | 805.41 mi (1,296.18 km) |
| Gelsenkirchen to Orta Nova | 813.29 mi (1,308.86 km) |
| Gelsenkirchen to Orte | 673.07 mi (1,083.20 km) |
| Gelsenkirchen to Ortona | 720.11 mi (1,158.90 km) |
| Gelsenkirchen to Orvieto | 651.57 mi (1,048.60 km) |
| Gelsenkirchen to Orzinuovi | 442.02 mi (711.37 km) |
| Gelsenkirchen to Osimo | 629.41 mi (1,012.93 km) |
| Gelsenkirchen to Ospitaletto | 433.68 mi (697.94 km) |
| Gelsenkirchen to Ostuni | 896.44 mi (1,442.69 km) |
| Gelsenkirchen to Ottaviano | 816.14 mi (1,313.46 km) |
| Gelsenkirchen to Ovada | 480.49 mi (773.28 km) |
| Gelsenkirchen to Ozieri | 760.74 mi (1,224.29 km) |
| Gelsenkirchen to Paceco | 971.87 mi (1,564.07 km) |
| Gelsenkirchen to Pachino | 1,095.29 mi (1,762.70 km) |
