| Guastalla to Octeville | 661.38 mi (1,064.38 km) |
| Guastalla to Oignies | 523.41 mi (842.35 km) |
| Guastalla to Oissel | 543.49 mi (874.66 km) |
| Guastalla to Olivet | 464.38 mi (747.34 km) |
| Guastalla to Ollioules | 269.03 mi (432.96 km) |
| Guastalla to Olonne-sur-Mer | 609.66 mi (981.16 km) |
| Guastalla to Oloron-Sainte-Marie | 571.79 mi (920.20 km) |
| Guastalla to Onet Village | 398.54 mi (641.39 km) |
| Guastalla to Onnaing | 500.68 mi (805.77 km) |
| Guastalla to Orange | 293.40 mi (472.19 km) |
| Guastalla to Orchies | 515.85 mi (830.17 km) |
| Guastalla to Orleans | 465.06 mi (748.44 km) |
| Guastalla to Orly | 471.70 mi (759.13 km) |
| Guastalla to Ormesson-sur-Marne | 467.56 mi (752.46 km) |
| Guastalla to Orsay | 478.17 mi (769.53 km) |
