| Lowell to Smolyan | 4,624.41 mi (7,442.28 km) |
| Lowell to Sofia | 4,521.99 mi (7,277.45 km) |
| Lowell to Sopot | 4,581.94 mi (7,373.92 km) |
| Lowell to Sozopol | 4,710.57 mi (7,580.94 km) |
| Lowell to Sredets | 4,693.43 mi (7,553.35 km) |
| Lowell to Stamboliyski | 4,594.61 mi (7,394.31 km) |
| Lowell to Stara Zagora | 4,627.47 mi (7,447.20 km) |
| Lowell to Svilengrad | 4,677.96 mi (7,528.45 km) |
| Lowell to Svishtov | 4,565.95 mi (7,348.19 km) |
| Lowell to Targovishte | 4,630.53 mi (7,452.11 km) |
| Lowell to Teteven | 4,551.28 mi (7,324.57 km) |
| Lowell to Troyan | 4,570.90 mi (7,356.16 km) |
| Lowell to Tryavna | 4,603.23 mi (7,408.18 km) |
| Lowell to Tutrakan | 4,598.16 mi (7,400.03 km) |
| Lowell to Varna | 4,684.82 mi (7,539.50 km) |
