| Bilthoven to Smolyan | 1,168.28 mi (1,880.16 km) |
| Bilthoven to Sofia | 1,064.13 mi (1,712.55 km) |
| Bilthoven to Sopot | 1,119.02 mi (1,800.90 km) |
| Bilthoven to Sozopol | 1,242.27 mi (1,999.24 km) |
| Bilthoven to Sredets | 1,225.94 mi (1,972.96 km) |
| Bilthoven to Stamboliyski | 1,135.47 mi (1,827.37 km) |
| Bilthoven to Stara Zagora | 1,162.96 mi (1,871.61 km) |
| Bilthoven to Svilengrad | 1,214.93 mi (1,955.23 km) |
| Bilthoven to Svishtov | 1,098.03 mi (1,767.11 km) |
| Bilthoven to Targovishte | 1,161.94 mi (1,869.96 km) |
| Bilthoven to Teteven | 1,088.50 mi (1,751.78 km) |
| Bilthoven to Troyan | 1,106.93 mi (1,781.43 km) |
| Bilthoven to Tryavna | 1,137.33 mi (1,830.36 km) |
| Bilthoven to Tutrakan | 1,129.03 mi (1,816.99 km) |
| Bilthoven to Varna | 1,215.68 mi (1,956.45 km) |
