| Grand Island to Smolyan | 5,716.51 mi (9,199.83 km) |
| Grand Island to Sofia | 5,612.28 mi (9,032.09 km) |
| Grand Island to Sopot | 5,661.44 mi (9,111.21 km) |
| Grand Island to Sozopol | 5,768.18 mi (9,282.99 km) |
| Grand Island to Sredets | 5,756.07 mi (9,263.50 km) |
| Grand Island to Stamboliyski | 5,681.80 mi (9,143.98 km) |
| Grand Island to Stara Zagora | 5,702.11 mi (9,176.67 km) |
| Grand Island to Svilengrad | 5,755.65 mi (9,262.83 km) |
| Grand Island to Svishtov | 5,629.26 mi (9,059.41 km) |
| Grand Island to Targovishte | 5,687.93 mi (9,153.84 km) |
| Grand Island to Teteven | 5,631.58 mi (9,063.16 km) |
| Grand Island to Troyan | 5,647.97 mi (9,089.52 km) |
| Grand Island to Tryavna | 5,674.09 mi (9,131.57 km) |
| Grand Island to Tutrakan | 5,645.84 mi (9,086.10 km) |
| Grand Island to Varna | 5,731.31 mi (9,223.66 km) |
