| Swallownest to Smolyan | 1,449.84 mi (2,333.29 km) |
| Swallownest to Sofia | 1,345.99 mi (2,166.16 km) |
| Swallownest to Sopot | 1,402.47 mi (2,257.06 km) |
| Swallownest to Sozopol | 1,527.51 mi (2,458.28 km) |
| Swallownest to Sredets | 1,510.88 mi (2,431.53 km) |
| Swallownest to Stamboliyski | 1,417.83 mi (2,281.77 km) |
| Swallownest to Stara Zagora | 1,446.93 mi (2,328.61 km) |
| Swallownest to Svilengrad | 1,498.50 mi (2,411.60 km) |
| Swallownest to Svishtov | 1,383.09 mi (2,225.88 km) |
| Swallownest to Targovishte | 1,447.28 mi (2,329.16 km) |
| Swallownest to Teteven | 1,371.88 mi (2,207.83 km) |
| Swallownest to Troyan | 1,390.69 mi (2,238.10 km) |
| Swallownest to Tryavna | 1,421.72 mi (2,288.03 km) |
| Swallownest to Tutrakan | 1,414.73 mi (2,276.79 km) |
| Swallownest to Varna | 1,501.35 mi (2,416.20 km) |
