| Waltham Cross to Octeville | 158.78 mi (255.53 km) |
| Waltham Cross to Oignies | 155.96 mi (251.00 km) |
| Waltham Cross to Oissel | 169.32 mi (272.50 km) |
| Waltham Cross to Olivet | 277.79 mi (447.06 km) |
| Waltham Cross to Ollioules | 650.86 mi (1,047.45 km) |
| Waltham Cross to Olonne-sur-Mer | 364.39 mi (586.43 km) |
| Waltham Cross to Oloron-Sainte-Marie | 587.33 mi (945.22 km) |
| Waltham Cross to Onet Village | 520.06 mi (836.95 km) |
| Waltham Cross to Onnaing | 181.45 mi (292.02 km) |
| Waltham Cross to Orange | 567.36 mi (913.08 km) |
| Waltham Cross to Orchies | 165.03 mi (265.58 km) |
| Waltham Cross to Orleans | 275.37 mi (443.16 km) |
| Waltham Cross to Orly | 229.81 mi (369.84 km) |
| Waltham Cross to Ormesson-sur-Marne | 230.33 mi (370.68 km) |
| Waltham Cross to Orsay | 228.59 mi (367.89 km) |
