| Princeton to Smolyan | 5,780.60 mi (9,302.97 km) |
| Princeton to Sofia | 5,682.23 mi (9,144.66 km) |
| Princeton to Sopot | 5,747.41 mi (9,249.56 km) |
| Princeton to Sozopol | 5,885.90 mi (9,472.44 km) |
| Princeton to Sredets | 5,866.24 mi (9,440.80 km) |
| Princeton to Stamboliyski | 5,754.82 mi (9,261.49 km) |
| Princeton to Stara Zagora | 5,794.74 mi (9,325.73 km) |
| Princeton to Svilengrad | 5,841.96 mi (9,401.72 km) |
| Princeton to Svishtov | 5,741.69 mi (9,240.35 km) |
| Princeton to Targovishte | 5,808.03 mi (9,347.12 km) |
| Princeton to Teteven | 5,717.07 mi (9,200.74 km) |
| Princeton to Troyan | 5,738.19 mi (9,234.72 km) |
| Princeton to Tryavna | 5,773.46 mi (9,291.48 km) |
| Princeton to Tutrakan | 5,782.02 mi (9,305.26 km) |
| Princeton to Varna | 5,867.17 mi (9,442.30 km) |
