| Apen to Smolyan | 1,121.73 mi (1,805.26 km) |
| Apen to Sofia | 1,017.63 mi (1,637.72 km) |
| Apen to Sopot | 1,066.66 mi (1,716.63 km) |
| Apen to Sozopol | 1,180.00 mi (1,899.03 km) |
| Apen to Sredets | 1,165.75 mi (1,876.10 km) |
| Apen to Stamboliyski | 1,086.79 mi (1,749.02 km) |
| Apen to Stara Zagora | 1,108.14 mi (1,783.38 km) |
| Apen to Svilengrad | 1,161.37 mi (1,869.04 km) |
| Apen to Svishtov | 1,037.88 mi (1,670.31 km) |
| Apen to Targovishte | 1,099.28 mi (1,769.12 km) |
| Apen to Teteven | 1,036.68 mi (1,668.38 km) |
| Apen to Troyan | 1,053.42 mi (1,695.32 km) |
| Apen to Tryavna | 1,080.78 mi (1,739.35 km) |
| Apen to Tutrakan | 1,061.87 mi (1,708.91 km) |
| Apen to Varna | 1,148.65 mi (1,848.57 km) |
