| Biggleswade to Smolyan | 1,374.42 mi (2,211.92 km) |
| Biggleswade to Sofia | 1,271.16 mi (2,045.73 km) |
| Biggleswade to Sopot | 1,329.83 mi (2,140.16 km) |
| Biggleswade to Sozopol | 1,458.91 mi (2,347.89 km) |
| Biggleswade to Sredets | 1,441.33 mi (2,319.60 km) |
| Biggleswade to Stamboliyski | 1,343.49 mi (2,162.14 km) |
| Biggleswade to Stara Zagora | 1,375.16 mi (2,213.11 km) |
| Biggleswade to Svilengrad | 1,425.90 mi (2,294.76 km) |
| Biggleswade to Svishtov | 1,314.15 mi (2,114.92 km) |
| Biggleswade to Targovishte | 1,379.23 mi (2,219.65 km) |
| Biggleswade to Teteven | 1,299.17 mi (2,090.82 km) |
| Biggleswade to Troyan | 1,318.63 mi (2,122.13 km) |
| Biggleswade to Tryavna | 1,350.87 mi (2,174.02 km) |
| Biggleswade to Tutrakan | 1,349.11 mi (2,171.19 km) |
| Biggleswade to Varna | 1,435.29 mi (2,309.88 km) |
