| Sleaford to Opole | 797.37 mi (1,283.25 km) |
| Sleaford to Orzesze | 843.31 mi (1,357.17 km) |
| Sleaford to Osowa | 776.13 mi (1,249.06 km) |
| Sleaford to Ostroda | 839.09 mi (1,350.38 km) |
| Sleaford to Ostroleka | 909.71 mi (1,464.03 km) |
| Sleaford to Ostrow Mazowiecka | 926.34 mi (1,490.80 km) |
| Sleaford to Ostrow Wielkopolski | 773.31 mi (1,244.53 km) |
| Sleaford to Ostrowiec Swietokrzyski | 935.74 mi (1,505.93 km) |
| Sleaford to Ostrzeszow | 782.24 mi (1,258.89 km) |
| Sleaford to Oswiecim | 865.58 mi (1,393.02 km) |
| Sleaford to Otwock | 909.25 mi (1,463.29 km) |
| Sleaford to Ozarow Mazowiecki | 888.46 mi (1,429.83 km) |
| Sleaford to Ozimek | 808.84 mi (1,301.70 km) |
| Sleaford to Ozorkow | 829.22 mi (1,334.49 km) |
| Sleaford to Pabianice | 838.45 mi (1,349.36 km) |
