| Kirkby to Smolyan | 1,512.44 mi (2,434.04 km) |
| Kirkby to Sofia | 1,408.72 mi (2,267.11 km) |
| Kirkby to Sopot | 1,465.71 mi (2,358.84 km) |
| Kirkby to Sozopol | 1,591.49 mi (2,561.26 km) |
| Kirkby to Sredets | 1,574.72 mi (2,534.26 km) |
| Kirkby to Stamboliyski | 1,480.69 mi (2,382.94 km) |
| Kirkby to Stara Zagora | 1,510.36 mi (2,430.69 km) |
| Kirkby to Svilengrad | 1,561.77 mi (2,513.42 km) |
| Kirkby to Svishtov | 1,447.00 mi (2,328.73 km) |
| Kirkby to Targovishte | 1,511.33 mi (2,432.25 km) |
| Kirkby to Teteven | 1,435.10 mi (2,309.57 km) |
| Kirkby to Troyan | 1,454.05 mi (2,340.06 km) |
| Kirkby to Tryavna | 1,485.31 mi (2,390.38 km) |
| Kirkby to Tutrakan | 1,479.09 mi (2,380.37 km) |
| Kirkby to Varna | 1,565.67 mi (2,519.71 km) |
