| Sleaford to Noventa Vicentina | 756.81 mi (1,217.97 km) |
| Sleaford to Novi di Modena | 757.86 mi (1,219.66 km) |
| Sleaford to Novi Ligure | 704.91 mi (1,134.44 km) |
| Sleaford to Nuoro | 988.44 mi (1,590.74 km) |
| Sleaford to Occhiobello | 777.35 mi (1,251.03 km) |
| Sleaford to Oderzo | 763.12 mi (1,228.12 km) |
| Sleaford to Oggiono | 663.01 mi (1,067.01 km) |
| Sleaford to Olbia | 954.58 mi (1,536.24 km) |
| Sleaford to Oleggio | 652.62 mi (1,050.29 km) |
| Sleaford to Olgiate Comasco | 651.83 mi (1,049.01 km) |
| Sleaford to Olgiate Olona | 657.78 mi (1,058.60 km) |
| Sleaford to Omegna | 630.63 mi (1,014.90 km) |
| Sleaford to Opera | 681.25 mi (1,096.36 km) |
| Sleaford to Oppeano | 744.86 mi (1,198.73 km) |
| Sleaford to Orbassano | 658.30 mi (1,059.43 km) |
