| Boxley to Smolyan | 1,322.77 mi (2,128.79 km) |
| Boxley to Sofia | 1,220.00 mi (1,963.39 km) |
| Boxley to Sopot | 1,279.96 mi (2,059.90 km) |
| Boxley to Sozopol | 1,411.40 mi (2,271.43 km) |
| Boxley to Sredets | 1,393.26 mi (2,242.23 km) |
| Boxley to Stamboliyski | 1,292.55 mi (2,080.15 km) |
| Boxley to Stara Zagora | 1,325.78 mi (2,133.63 km) |
| Boxley to Svilengrad | 1,375.93 mi (2,214.35 km) |
| Boxley to Svishtov | 1,266.62 mi (2,038.42 km) |
| Boxley to Targovishte | 1,332.17 mi (2,143.92 km) |
| Boxley to Teteven | 1,249.30 mi (2,010.55 km) |
| Boxley to Troyan | 1,269.13 mi (2,042.47 km) |
| Boxley to Tryavna | 1,302.10 mi (2,095.52 km) |
| Boxley to Tutrakan | 1,303.63 mi (2,097.99 km) |
| Boxley to Varna | 1,389.41 mi (2,236.03 km) |
