| Gallarate to Octeville | 556.84 mi (896.14 km) |
| Gallarate to Oignies | 426.17 mi (685.85 km) |
| Gallarate to Oissel | 439.78 mi (707.76 km) |
| Gallarate to Olivet | 359.61 mi (578.74 km) |
| Gallarate to Ollioules | 227.07 mi (365.43 km) |
| Gallarate to Olonne-sur-Mer | 509.30 mi (819.63 km) |
| Gallarate to Oloron-Sainte-Marie | 493.76 mi (794.63 km) |
| Gallarate to Onet Village | 315.66 mi (508.00 km) |
| Gallarate to Onnaing | 404.84 mi (651.53 km) |
| Gallarate to Orange | 221.54 mi (356.54 km) |
| Gallarate to Orchies | 419.31 mi (674.82 km) |
| Gallarate to Orleans | 360.28 mi (579.82 km) |
| Gallarate to Orly | 367.86 mi (592.02 km) |
| Gallarate to Ormesson-sur-Marne | 363.93 mi (585.69 km) |
| Gallarate to Orsay | 374.09 mi (602.04 km) |
