| Westbrook to Smolyan | 4,542.25 mi (7,310.05 km) |
| Westbrook to Sofia | 4,439.67 mi (7,144.96 km) |
| Westbrook to Sopot | 4,499.28 mi (7,240.89 km) |
| Westbrook to Sozopol | 4,627.28 mi (7,446.89 km) |
| Westbrook to Sredets | 4,610.29 mi (7,419.55 km) |
| Westbrook to Stamboliyski | 4,512.24 mi (7,261.74 km) |
| Westbrook to Stara Zagora | 4,544.68 mi (7,313.96 km) |
| Westbrook to Svilengrad | 4,595.32 mi (7,395.46 km) |
| Westbrook to Svishtov | 4,482.72 mi (7,214.24 km) |
| Westbrook to Targovishte | 4,547.16 mi (7,317.95 km) |
| Westbrook to Teteven | 4,468.62 mi (7,191.54 km) |
| Westbrook to Troyan | 4,488.14 mi (7,222.97 km) |
| Westbrook to Tryavna | 4,520.28 mi (7,274.69 km) |
| Westbrook to Tutrakan | 4,514.46 mi (7,265.32 km) |
| Westbrook to Varna | 4,601.16 mi (7,404.86 km) |
