| Giffnock to Smolyan | 1,627.62 mi (2,619.40 km) |
| Giffnock to Sofia | 1,523.34 mi (2,451.58 km) |
| Giffnock to Sopot | 1,576.24 mi (2,536.71 km) |
| Giffnock to Sozopol | 1,694.35 mi (2,726.79 km) |
| Giffnock to Sredets | 1,679.31 mi (2,702.60 km) |
| Giffnock to Stamboliyski | 1,594.10 mi (2,565.46 km) |
| Giffnock to Stara Zagora | 1,619.14 mi (2,605.76 km) |
| Giffnock to Svilengrad | 1,671.76 mi (2,690.44 km) |
| Giffnock to Svishtov | 1,551.26 mi (2,496.51 km) |
| Giffnock to Targovishte | 1,613.67 mi (2,596.94 km) |
| Giffnock to Teteven | 1,545.89 mi (2,487.87 km) |
| Giffnock to Troyan | 1,563.63 mi (2,516.42 km) |
| Giffnock to Tryavna | 1,592.62 mi (2,563.07 km) |
| Giffnock to Tutrakan | 1,577.46 mi (2,538.68 km) |
| Giffnock to Varna | 1,664.29 mi (2,678.42 km) |
