| Harlingen to Smolyan | 1,199.00 mi (1,929.61 km) |
| Harlingen to Sofia | 1,094.70 mi (1,761.75 km) |
| Harlingen to Sopot | 1,146.62 mi (1,845.31 km) |
| Harlingen to Sozopol | 1,264.57 mi (2,035.13 km) |
| Harlingen to Sredets | 1,249.40 mi (2,010.72 km) |
| Harlingen to Stamboliyski | 1,165.04 mi (1,874.95 km) |
| Harlingen to Stara Zagora | 1,189.31 mi (1,914.00 km) |
| Harlingen to Svilengrad | 1,242.03 mi (1,998.85 km) |
| Harlingen to Svishtov | 1,121.34 mi (1,804.62 km) |
| Harlingen to Targovishte | 1,183.91 mi (1,905.33 km) |
| Harlingen to Teteven | 1,116.34 mi (1,796.58 km) |
| Harlingen to Troyan | 1,133.90 mi (1,824.83 km) |
| Harlingen to Tryavna | 1,162.69 mi (1,871.17 km) |
| Harlingen to Tutrakan | 1,148.34 mi (1,848.08 km) |
| Harlingen to Varna | 1,235.18 mi (1,987.83 km) |
