| Killingworth to Smolyan | 1,507.67 mi (2,426.36 km) |
| Killingworth to Sofia | 1,403.39 mi (2,258.54 km) |
| Killingworth to Sopot | 1,456.40 mi (2,343.84 km) |
| Killingworth to Sozopol | 1,575.05 mi (2,534.80 km) |
| Killingworth to Sredets | 1,559.86 mi (2,510.35 km) |
| Killingworth to Stamboliyski | 1,474.18 mi (2,372.46 km) |
| Killingworth to Stara Zagora | 1,499.39 mi (2,413.04 km) |
| Killingworth to Svilengrad | 1,551.96 mi (2,497.64 km) |
| Killingworth to Svishtov | 1,431.79 mi (2,304.25 km) |
| Killingworth to Targovishte | 1,494.39 mi (2,404.99 km) |
| Killingworth to Teteven | 1,426.04 mi (2,294.98 km) |
| Killingworth to Troyan | 1,443.83 mi (2,323.62 km) |
| Killingworth to Tryavna | 1,472.95 mi (2,370.48 km) |
| Killingworth to Tutrakan | 1,458.59 mi (2,347.38 km) |
| Killingworth to Varna | 1,545.43 mi (2,487.13 km) |
