| Sleaford to Octeville | 238.76 mi (384.24 km) |
| Sleaford to Oignies | 227.39 mi (365.95 km) |
| Sleaford to Oissel | 260.73 mi (419.61 km) |
| Sleaford to Olivet | 368.87 mi (593.65 km) |
| Sleaford to Ollioules | 739.13 mi (1,189.52 km) |
| Sleaford to Olonne-sur-Mer | 450.42 mi (724.88 km) |
| Sleaford to Oloron-Sainte-Marie | 677.30 mi (1,090.00 km) |
| Sleaford to Onet Village | 611.73 mi (984.48 km) |
| Sleaford to Onnaing | 248.90 mi (400.57 km) |
| Sleaford to Orange | 656.51 mi (1,056.55 km) |
| Sleaford to Orchies | 234.11 mi (376.76 km) |
| Sleaford to Orleans | 366.40 mi (589.67 km) |
| Sleaford to Orly | 318.18 mi (512.07 km) |
| Sleaford to Ormesson-sur-Marne | 318.00 mi (511.77 km) |
| Sleaford to Orsay | 317.83 mi (511.50 km) |
