| Round Lake to Smolyan | 5,288.41 mi (8,510.88 km) |
| Round Lake to Sofia | 5,184.22 mi (8,343.20 km) |
| Round Lake to Sopot | 5,237.69 mi (8,429.24 km) |
| Round Lake to Sozopol | 5,353.28 mi (8,615.27 km) |
| Round Lake to Sredets | 5,339.21 mi (8,592.62 km) |
| Round Lake to Stamboliyski | 5,255.32 mi (8,457.62 km) |
| Round Lake to Stara Zagora | 5,280.43 mi (8,498.03 km) |
| Round Lake to Svilengrad | 5,333.17 mi (8,582.90 km) |
| Round Lake to Svishtov | 5,211.32 mi (8,386.80 km) |
| Round Lake to Targovishte | 5,272.57 mi (8,485.38 km) |
| Round Lake to Teteven | 5,207.34 mi (8,380.41 km) |
| Round Lake to Troyan | 5,225.04 mi (8,408.88 km) |
| Round Lake to Tryavna | 5,253.63 mi (8,454.90 km) |
| Round Lake to Tutrakan | 5,233.82 mi (8,423.02 km) |
| Round Lake to Varna | 5,320.32 mi (8,562.23 km) |
