| Keller to Smolyan | 6,104.18 mi (9,823.73 km) |
| Keller to Sofia | 6,000.08 mi (9,656.20 km) |
| Keller to Sopot | 6,054.30 mi (9,743.45 km) |
| Keller to Sozopol | 6,171.01 mi (9,931.28 km) |
| Keller to Sredets | 6,156.73 mi (9,908.30 km) |
| Keller to Stamboliyski | 6,071.43 mi (9,771.02 km) |
| Keller to Stara Zagora | 6,097.34 mi (9,812.71 km) |
| Keller to Svilengrad | 6,149.92 mi (9,897.33 km) |
| Keller to Svishtov | 6,028.77 mi (9,702.37 km) |
| Keller to Targovishte | 6,090.29 mi (9,801.37 km) |
| Keller to Teteven | 6,023.89 mi (9,694.52 km) |
| Keller to Troyan | 6,041.79 mi (9,723.32 km) |
| Keller to Tryavna | 6,070.74 mi (9,769.90 km) |
| Keller to Tutrakan | 6,051.86 mi (9,739.52 km) |
| Keller to Varna | 6,138.41 mi (9,878.81 km) |
