| Great Falls to Smolyan | 5,718.81 mi (9,203.53 km) |
| Great Falls to Sofia | 5,617.44 mi (9,040.40 km) |
| Great Falls to Sopot | 5,655.10 mi (9,101.00 km) |
| Great Falls to Sozopol | 5,738.52 mi (9,235.25 km) |
| Great Falls to Sredets | 5,731.19 mi (9,223.45 km) |
| Great Falls to Stamboliyski | 5,681.28 mi (9,143.14 km) |
| Great Falls to Stara Zagora | 5,689.83 mi (9,156.89 km) |
| Great Falls to Svilengrad | 5,743.70 mi (9,243.60 km) |
| Great Falls to Svishtov | 5,610.46 mi (9,029.16 km) |
| Great Falls to Targovishte | 5,661.59 mi (9,111.44 km) |
| Great Falls to Teteven | 5,627.23 mi (9,056.15 km) |
| Great Falls to Troyan | 5,640.10 mi (9,076.87 km) |
| Great Falls to Tryavna | 5,659.77 mi (9,108.52 km) |
| Great Falls to Tutrakan | 5,613.21 mi (9,033.59 km) |
| Great Falls to Varna | 5,693.94 mi (9,163.51 km) |
