| Nieuwkoop to Smolyan | 1,185.98 mi (1,908.65 km) |
| Nieuwkoop to Sofia | 1,081.86 mi (1,741.09 km) |
| Nieuwkoop to Sopot | 1,137.00 mi (1,829.82 km) |
| Nieuwkoop to Sozopol | 1,260.58 mi (2,028.70 km) |
| Nieuwkoop to Sredets | 1,244.18 mi (2,002.31 km) |
| Nieuwkoop to Stamboliyski | 1,153.28 mi (1,856.03 km) |
| Nieuwkoop to Stara Zagora | 1,181.02 mi (1,900.67 km) |
| Nieuwkoop to Svilengrad | 1,232.92 mi (1,984.20 km) |
| Nieuwkoop to Svishtov | 1,116.29 mi (1,796.50 km) |
| Nieuwkoop to Targovishte | 1,180.27 mi (1,899.46 km) |
| Nieuwkoop to Teteven | 1,106.46 mi (1,780.68 km) |
| Nieuwkoop to Troyan | 1,124.95 mi (1,810.43 km) |
| Nieuwkoop to Tryavna | 1,155.46 mi (1,859.53 km) |
| Nieuwkoop to Tutrakan | 1,147.49 mi (1,846.70 km) |
| Nieuwkoop to Varna | 1,234.12 mi (1,986.13 km) |
