| Borehamwood to Smolyan | 1,364.30 mi (2,195.63 km) |
| Borehamwood to Sofia | 1,261.38 mi (2,030.00 km) |
| Borehamwood to Sopot | 1,320.97 mi (2,125.90 km) |
| Borehamwood to Sozopol | 1,451.66 mi (2,336.22 km) |
| Borehamwood to Sredets | 1,433.70 mi (2,307.32 km) |
| Borehamwood to Stamboliyski | 1,333.88 mi (2,146.67 km) |
| Borehamwood to Stara Zagora | 1,366.64 mi (2,199.39 km) |
| Borehamwood to Svilengrad | 1,416.98 mi (2,280.41 km) |
| Borehamwood to Svishtov | 1,306.86 mi (2,103.20 km) |
| Borehamwood to Targovishte | 1,372.26 mi (2,208.45 km) |
| Borehamwood to Teteven | 1,290.31 mi (2,076.55 km) |
| Borehamwood to Troyan | 1,310.02 mi (2,108.28 km) |
| Borehamwood to Tryavna | 1,342.76 mi (2,160.97 km) |
| Borehamwood to Tutrakan | 1,343.16 mi (2,161.60 km) |
| Borehamwood to Varna | 1,429.09 mi (2,299.90 km) |
