| Swindon to Smolyan | 1,422.95 mi (2,290.01 km) |
| Swindon to Sofia | 1,320.41 mi (2,124.99 km) |
| Swindon to Sopot | 1,380.81 mi (2,222.20 km) |
| Swindon to Sozopol | 1,512.79 mi (2,434.60 km) |
| Swindon to Sredets | 1,494.54 mi (2,405.23 km) |
| Swindon to Stamboliyski | 1,393.03 mi (2,241.86 km) |
| Swindon to Stara Zagora | 1,426.76 mi (2,296.15 km) |
| Swindon to Svilengrad | 1,476.74 mi (2,376.59 km) |
| Swindon to Svishtov | 1,368.01 mi (2,201.60 km) |
| Swindon to Targovishte | 1,433.63 mi (2,307.20 km) |
| Swindon to Teteven | 1,350.16 mi (2,172.87 km) |
| Swindon to Troyan | 1,370.10 mi (2,204.96 km) |
| Swindon to Tryavna | 1,403.24 mi (2,258.30 km) |
| Swindon to Tutrakan | 1,405.23 mi (2,261.51 km) |
| Swindon to Varna | 1,490.98 mi (2,399.50 km) |
