| Gelsenkirchen to Navodari | 1,107.70 mi (1,782.67 km) |
| Gelsenkirchen to Negresti-Oas | 769.95 mi (1,239.11 km) |
| Gelsenkirchen to Nehoiu | 974.05 mi (1,567.58 km) |
| Gelsenkirchen to Ocna Mures | 836.34 mi (1,345.96 km) |
| Gelsenkirchen to Odobesti | 990.28 mi (1,593.70 km) |
| Gelsenkirchen to Odorheiu Secuiesc | 898.16 mi (1,445.45 km) |
| Gelsenkirchen to Oltenita | 1,037.26 mi (1,669.30 km) |
| Gelsenkirchen to Onesti | 960.87 mi (1,546.38 km) |
| Gelsenkirchen to Oradea | 733.32 mi (1,180.17 km) |
| Gelsenkirchen to Orastie | 829.78 mi (1,335.40 km) |
| Gelsenkirchen to Oravita | 803.98 mi (1,293.88 km) |
| Gelsenkirchen to Orsova | 844.71 mi (1,359.43 km) |
| Gelsenkirchen to Otelu Rosu | 809.50 mi (1,302.76 km) |
| Gelsenkirchen to Otopeni | 995.76 mi (1,602.52 km) |
| Gelsenkirchen to Ovidiu | 1,107.52 mi (1,782.38 km) |
