| Barrhead to Smolyan | 1,630.83 mi (2,624.57 km) |
| Barrhead to Sofia | 1,526.55 mi (2,456.75 km) |
| Barrhead to Sopot | 1,579.51 mi (2,541.97 km) |
| Barrhead to Sozopol | 1,697.71 mi (2,732.20 km) |
| Barrhead to Sredets | 1,682.66 mi (2,707.97 km) |
| Barrhead to Stamboliyski | 1,597.33 mi (2,570.66 km) |
| Barrhead to Stara Zagora | 1,622.43 mi (2,611.06 km) |
| Barrhead to Svilengrad | 1,675.04 mi (2,695.72 km) |
| Barrhead to Svishtov | 1,554.60 mi (2,501.88 km) |
| Barrhead to Targovishte | 1,617.03 mi (2,602.36 km) |
| Barrhead to Teteven | 1,549.15 mi (2,493.12 km) |
| Barrhead to Troyan | 1,566.91 mi (2,521.70 km) |
| Barrhead to Tryavna | 1,595.93 mi (2,568.40 km) |
| Barrhead to Tutrakan | 1,580.87 mi (2,544.16 km) |
| Barrhead to Varna | 1,667.70 mi (2,683.90 km) |
