| Red Oak to Smolyan | 6,109.90 mi (9,832.94 km) |
| Red Oak to Sofia | 6,005.88 mi (9,665.53 km) |
| Red Oak to Sopot | 6,060.54 mi (9,753.50 km) |
| Red Oak to Sozopol | 6,178.16 mi (9,942.79 km) |
| Red Oak to Sredets | 6,163.68 mi (9,919.48 km) |
| Red Oak to Stamboliyski | 6,077.36 mi (9,780.56 km) |
| Red Oak to Stara Zagora | 6,103.79 mi (9,823.10 km) |
| Red Oak to Svilengrad | 6,156.25 mi (9,907.52 km) |
| Red Oak to Svishtov | 6,035.68 mi (9,713.48 km) |
| Red Oak to Targovishte | 6,097.44 mi (9,812.88 km) |
| Red Oak to Teteven | 6,030.10 mi (9,704.51 km) |
| Red Oak to Troyan | 6,048.13 mi (9,733.53 km) |
| Red Oak to Tryavna | 6,077.34 mi (9,780.53 km) |
| Red Oak to Tutrakan | 6,059.38 mi (9,751.64 km) |
| Red Oak to Varna | 6,146.00 mi (9,891.03 km) |
