| Boekel to Smolyan | 1,132.54 mi (1,822.64 km) |
| Boekel to Sofia | 1,028.52 mi (1,655.24 km) |
| Boekel to Sopot | 1,084.39 mi (1,745.15 km) |
| Boekel to Sozopol | 1,209.46 mi (1,946.44 km) |
| Boekel to Sredets | 1,192.71 mi (1,919.48 km) |
| Boekel to Stamboliyski | 1,100.14 mi (1,770.51 km) |
| Boekel to Stara Zagora | 1,128.73 mi (1,816.52 km) |
| Boekel to Svilengrad | 1,180.39 mi (1,899.65 km) |
| Boekel to Svishtov | 1,064.97 mi (1,713.91 km) |
| Boekel to Targovishte | 1,129.32 mi (1,817.47 km) |
| Boekel to Teteven | 1,053.81 mi (1,695.95 km) |
| Boekel to Troyan | 1,072.53 mi (1,726.07 km) |
| Boekel to Tryavna | 1,103.48 mi (1,775.87 km) |
| Boekel to Tutrakan | 1,097.48 mi (1,766.22 km) |
| Boekel to Varna | 1,183.97 mi (1,905.42 km) |
