| Upminster to Smolyan | 1,340.81 mi (2,157.82 km) |
| Upminster to Sofia | 1,237.87 mi (1,992.16 km) |
| Upminster to Sopot | 1,297.43 mi (2,088.01 km) |
| Upminster to Sozopol | 1,428.13 mi (2,298.35 km) |
| Upminster to Sredets | 1,410.16 mi (2,269.44 km) |
| Upminster to Stamboliyski | 1,310.36 mi (2,108.82 km) |
| Upminster to Stara Zagora | 1,343.09 mi (2,161.50 km) |
| Upminster to Svilengrad | 1,393.44 mi (2,242.53 km) |
| Upminster to Svishtov | 1,283.34 mi (2,065.33 km) |
| Upminster to Targovishte | 1,348.75 mi (2,170.60 km) |
| Upminster to Teteven | 1,266.77 mi (2,038.66 km) |
| Upminster to Troyan | 1,286.48 mi (2,070.39 km) |
| Upminster to Tryavna | 1,319.22 mi (2,123.08 km) |
| Upminster to Tutrakan | 1,319.70 mi (2,123.85 km) |
| Upminster to Varna | 1,405.61 mi (2,262.11 km) |
