| Basildon to Smolyan | 1,331.88 mi (2,143.45 km) |
| Basildon to Sofia | 1,228.87 mi (1,977.68 km) |
| Basildon to Sopot | 1,288.26 mi (2,073.26 km) |
| Basildon to Sozopol | 1,418.70 mi (2,283.18 km) |
| Basildon to Sredets | 1,400.80 mi (2,254.36 km) |
| Basildon to Stamboliyski | 1,301.33 mi (2,094.29 km) |
| Basildon to Stara Zagora | 1,333.87 mi (2,146.66 km) |
| Basildon to Svilengrad | 1,384.29 mi (2,227.80 km) |
| Basildon to Svishtov | 1,273.91 mi (2,050.16 km) |
| Basildon to Targovishte | 1,339.27 mi (2,155.35 km) |
| Basildon to Teteven | 1,257.60 mi (2,023.92 km) |
| Basildon to Troyan | 1,277.27 mi (2,055.57 km) |
| Basildon to Tryavna | 1,309.93 mi (2,108.12 km) |
| Basildon to Tutrakan | 1,310.08 mi (2,108.36 km) |
| Basildon to Varna | 1,396.03 mi (2,246.69 km) |
