| Holbrook to Smolyan | 4,772.93 mi (7,681.28 km) |
| Holbrook to Sofia | 4,670.77 mi (7,516.88 km) |
| Holbrook to Sopot | 4,731.23 mi (7,614.17 km) |
| Holbrook to Sozopol | 4,860.80 mi (7,822.70 km) |
| Holbrook to Sredets | 4,843.44 mi (7,794.76 km) |
| Holbrook to Stamboliyski | 4,743.45 mi (7,633.84 km) |
| Holbrook to Stara Zagora | 4,776.95 mi (7,687.77 km) |
| Holbrook to Svilengrad | 4,827.20 mi (7,768.63 km) |
| Holbrook to Svishtov | 4,716.11 mi (7,589.84 km) |
| Holbrook to Targovishte | 4,780.88 mi (7,694.08 km) |
| Holbrook to Teteven | 4,700.57 mi (7,564.83 km) |
| Holbrook to Troyan | 4,720.34 mi (7,596.65 km) |
| Holbrook to Tryavna | 4,752.94 mi (7,649.12 km) |
| Holbrook to Tutrakan | 4,749.02 mi (7,642.80 km) |
| Holbrook to Varna | 4,835.61 mi (7,782.17 km) |
