| Sleaford to Glyka Nera | 1,553.21 mi (2,499.65 km) |
| Sleaford to Grevena | 1,358.84 mi (2,186.84 km) |
| Sleaford to Ialysos | 1,790.24 mi (2,881.11 km) |
| Sleaford to Ilion | 1,545.80 mi (2,487.72 km) |
| Sleaford to Ilioupoli | 1,552.84 mi (2,499.05 km) |
| Sleaford to Ioannina | 1,360.77 mi (2,189.95 km) |
| Sleaford to Irakleio | 1,740.53 mi (2,801.11 km) |
| Sleaford to Irakleio | 1,547.27 mi (2,490.08 km) |
| Sleaford to Kaisariani | 1,551.28 mi (2,496.54 km) |
| Sleaford to Kalamaria | 1,388.16 mi (2,234.03 km) |
| Sleaford to Kalamata | 1,544.90 mi (2,486.28 km) |
| Sleaford to Kallithea | 1,550.20 mi (2,494.80 km) |
| Sleaford to Kalymnos | 1,717.93 mi (2,764.74 km) |
| Sleaford to Kalyvia Thorikou | 1,563.98 mi (2,516.98 km) |
| Sleaford to Kamatero | 1,544.83 mi (2,486.16 km) |
