| Johnston to Smolyan | 5,519.71 mi (8,883.11 km) |
| Johnston to Sofia | 5,415.41 mi (8,715.26 km) |
| Johnston to Sopot | 5,466.56 mi (8,797.57 km) |
| Johnston to Sozopol | 5,577.40 mi (8,975.96 km) |
| Johnston to Sredets | 5,564.39 mi (8,955.02 km) |
| Johnston to Stamboliyski | 5,485.70 mi (8,828.39 km) |
| Johnston to Stara Zagora | 5,508.20 mi (8,864.60 km) |
| Johnston to Svilengrad | 5,561.43 mi (8,950.26 km) |
| Johnston to Svishtov | 5,436.97 mi (8,749.96 km) |
| Johnston to Targovishte | 5,496.87 mi (8,846.36 km) |
| Johnston to Teteven | 5,436.45 mi (8,749.13 km) |
| Johnston to Troyan | 5,453.44 mi (8,776.47 km) |
| Johnston to Tryavna | 5,480.71 mi (8,820.35 km) |
| Johnston to Tutrakan | 5,456.25 mi (8,780.99 km) |
| Johnston to Varna | 5,542.27 mi (8,919.42 km) |
