| Gillingham to Smolyan | 1,324.54 mi (2,131.64 km) |
| Gillingham to Sofia | 1,221.69 mi (1,966.12 km) |
| Gillingham to Sopot | 1,281.48 mi (2,062.34 km) |
| Gillingham to Sozopol | 1,412.61 mi (2,273.37 km) |
| Gillingham to Sredets | 1,394.53 mi (2,244.28 km) |
| Gillingham to Stamboliyski | 1,294.22 mi (2,082.84 km) |
| Gillingham to Stara Zagora | 1,327.23 mi (2,135.97 km) |
| Gillingham to Svilengrad | 1,377.47 mi (2,216.82 km) |
| Gillingham to Svishtov | 1,267.81 mi (2,040.35 km) |
| Gillingham to Targovishte | 1,333.31 mi (2,145.76 km) |
| Gillingham to Teteven | 1,250.82 mi (2,012.99 km) |
| Gillingham to Troyan | 1,270.59 mi (2,044.82 km) |
| Gillingham to Tryavna | 1,303.46 mi (2,097.72 km) |
| Gillingham to Tutrakan | 1,304.57 mi (2,099.50 km) |
| Gillingham to Varna | 1,390.40 mi (2,237.63 km) |
