| Fitchburg to Smolyan | 4,646.63 mi (7,478.03 km) |
| Fitchburg to Sofia | 4,544.14 mi (7,313.09 km) |
| Fitchburg to Sopot | 4,603.95 mi (7,409.34 km) |
| Fitchburg to Sozopol | 4,732.31 mi (7,615.92 km) |
| Fitchburg to Sredets | 4,715.24 mi (7,588.44 km) |
| Fitchburg to Stamboliyski | 4,616.74 mi (7,429.93 km) |
| Fitchburg to Stara Zagora | 4,649.43 mi (7,482.54 km) |
| Fitchburg to Svilengrad | 4,699.98 mi (7,563.89 km) |
| Fitchburg to Svishtov | 4,587.71 mi (7,383.21 km) |
| Fitchburg to Targovishte | 4,652.22 mi (7,487.03 km) |
| Fitchburg to Teteven | 4,573.29 mi (7,360.00 km) |
| Fitchburg to Troyan | 4,592.87 mi (7,391.52 km) |
| Fitchburg to Tryavna | 4,625.12 mi (7,443.41 km) |
| Fitchburg to Tutrakan | 4,619.70 mi (7,434.69 km) |
| Fitchburg to Varna | 4,706.38 mi (7,574.19 km) |
