| Grande-Synthe to Oestrich-Winkel | 259.89 mi (418.25 km) |
| Grande-Synthe to Offenburg | 306.75 mi (493.67 km) |
| Grande-Synthe to Oftersheim | 300.06 mi (482.89 km) |
| Grande-Synthe to Ohrdruf | 367.20 mi (590.95 km) |
| Grande-Synthe to Ohringen | 342.49 mi (551.19 km) |
| Grande-Synthe to Olbernhau | 481.42 mi (774.77 km) |
| Grande-Synthe to Olching | 447.57 mi (720.30 km) |
| Grande-Synthe to Oldenburg | 290.83 mi (468.05 km) |
| Grande-Synthe to Oldenburg in Holstein | 424.86 mi (683.74 km) |
| Grande-Synthe to Olfen | 224.43 mi (361.19 km) |
| Grande-Synthe to Olpe | 240.34 mi (386.79 km) |
| Grande-Synthe to Olsberg | 268.61 mi (432.28 km) |
| Grande-Synthe to Oranienburg | 481.05 mi (774.17 km) |
| Grande-Synthe to Ortenberg | 298.97 mi (481.14 km) |
| Grande-Synthe to Oschatz | 468.20 mi (753.49 km) |
