| Grande-Synthe to Novi di Modena | 579.88 mi (933.23 km) |
| Grande-Synthe to Novi Ligure | 525.85 mi (846.27 km) |
| Grande-Synthe to Nuoro | 812.44 mi (1,307.49 km) |
| Grande-Synthe to Occhiobello | 600.33 mi (966.13 km) |
| Grande-Synthe to Oderzo | 590.09 mi (949.66 km) |
| Grande-Synthe to Oggiono | 484.46 mi (779.66 km) |
| Grande-Synthe to Olbia | 777.69 mi (1,251.58 km) |
| Grande-Synthe to Oleggio | 473.51 mi (762.05 km) |
| Grande-Synthe to Olgiate Comasco | 472.96 mi (761.16 km) |
| Grande-Synthe to Olgiate Olona | 478.78 mi (770.52 km) |
| Grande-Synthe to Omegna | 451.54 mi (726.68 km) |
| Grande-Synthe to Opera | 502.28 mi (808.33 km) |
| Grande-Synthe to Oppeano | 567.94 mi (914.01 km) |
| Grande-Synthe to Orbassano | 480.10 mi (772.65 km) |
| Grande-Synthe to Orbetello | 726.23 mi (1,168.75 km) |
