| Willimantic to Smolyan | 4,698.88 mi (7,562.12 km) |
| Willimantic to Sofia | 4,596.60 mi (7,397.51 km) |
| Willimantic to Sopot | 4,656.80 mi (7,494.39 km) |
| Willimantic to Sozopol | 4,785.91 mi (7,702.18 km) |
| Willimantic to Sredets | 4,768.66 mi (7,674.41 km) |
| Willimantic to Stamboliyski | 4,669.24 mi (7,514.42 km) |
| Willimantic to Stara Zagora | 4,702.43 mi (7,567.83 km) |
| Willimantic to Svilengrad | 4,752.80 mi (7,648.89 km) |
| Willimantic to Svishtov | 4,641.25 mi (7,469.37 km) |
| Willimantic to Targovishte | 4,705.92 mi (7,573.45 km) |
| Willimantic to Teteven | 4,626.14 mi (7,445.05 km) |
| Willimantic to Troyan | 4,645.84 mi (7,476.75 km) |
| Willimantic to Tryavna | 4,678.30 mi (7,529.00 km) |
| Willimantic to Tutrakan | 4,673.81 mi (7,521.78 km) |
| Willimantic to Varna | 4,760.45 mi (7,661.20 km) |
