| Kettering to Smolyan | 1,400.71 mi (2,254.23 km) |
| Kettering to Sofia | 1,297.32 mi (2,087.83 km) |
| Kettering to Sopot | 1,355.56 mi (2,181.56 km) |
| Kettering to Sozopol | 1,483.82 mi (2,387.98 km) |
| Kettering to Sredets | 1,466.45 mi (2,360.02 km) |
| Kettering to Stamboliyski | 1,369.56 mi (2,204.10 km) |
| Kettering to Stara Zagora | 1,400.72 mi (2,254.24 km) |
| Kettering to Svilengrad | 1,451.64 mi (2,336.18 km) |
| Kettering to Svishtov | 1,339.10 mi (2,155.08 km) |
| Kettering to Targovishte | 1,404.01 mi (2,259.53 km) |
| Kettering to Teteven | 1,324.91 mi (2,132.23 km) |
| Kettering to Troyan | 1,344.24 mi (2,163.34 km) |
| Kettering to Tryavna | 1,376.24 mi (2,214.84 km) |
| Kettering to Tutrakan | 1,373.36 mi (2,210.21 km) |
| Kettering to Varna | 1,459.66 mi (2,349.09 km) |
