| Echelon to Smolyan | 4,893.09 mi (7,874.67 km) |
| Echelon to Sofia | 4,790.87 mi (7,710.17 km) |
| Echelon to Sopot | 4,851.20 mi (7,807.24 km) |
| Echelon to Sozopol | 4,980.47 mi (8,015.29 km) |
| Echelon to Sredets | 4,963.18 mi (7,987.47 km) |
| Echelon to Stamboliyski | 4,863.54 mi (7,827.10 km) |
| Echelon to Stara Zagora | 4,896.87 mi (7,880.75 km) |
| Echelon to Svilengrad | 4,947.18 mi (7,961.72 km) |
| Echelon to Svishtov | 4,835.80 mi (7,782.47 km) |
| Echelon to Targovishte | 4,900.50 mi (7,886.59 km) |
| Echelon to Teteven | 4,820.53 mi (7,757.90 km) |
| Echelon to Troyan | 4,840.26 mi (7,789.65 km) |
| Echelon to Tryavna | 4,872.78 mi (7,841.99 km) |
| Echelon to Tutrakan | 4,868.44 mi (7,834.99 km) |
| Echelon to Varna | 4,955.06 mi (7,974.40 km) |
