| Uniondale to Smolyan | 4,797.92 mi (7,721.50 km) |
| Uniondale to Sofia | 4,695.69 mi (7,556.98 km) |
| Uniondale to Sopot | 4,756.01 mi (7,654.05 km) |
| Uniondale to Sozopol | 4,885.30 mi (7,862.13 km) |
| Uniondale to Sredets | 4,868.01 mi (7,834.30 km) |
| Uniondale to Stamboliyski | 4,768.35 mi (7,673.92 km) |
| Uniondale to Stara Zagora | 4,801.68 mi (7,727.56 km) |
| Uniondale to Svilengrad | 4,852.00 mi (7,808.53 km) |
| Uniondale to Svishtov | 4,740.63 mi (7,629.30 km) |
| Uniondale to Targovishte | 4,805.34 mi (7,733.44 km) |
| Uniondale to Teteven | 4,725.35 mi (7,604.71 km) |
| Uniondale to Troyan | 4,745.08 mi (7,636.46 km) |
| Uniondale to Tryavna | 4,777.60 mi (7,688.80 km) |
| Uniondale to Tutrakan | 4,773.31 mi (7,681.90 km) |
| Uniondale to Varna | 4,859.93 mi (7,821.30 km) |
