| Gallup to Smolyan | 6,349.27 mi (10,218.16 km) |
| Gallup to Sofia | 6,245.46 mi (10,051.09 km) |
| Gallup to Sopot | 6,291.32 mi (10,124.90 km) |
| Gallup to Sozopol | 6,391.02 mi (10,285.35 km) |
| Gallup to Sredets | 6,380.44 mi (10,268.32 km) |
| Gallup to Stamboliyski | 6,313.56 mi (10,160.69 km) |
| Gallup to Stara Zagora | 6,330.31 mi (10,187.65 km) |
| Gallup to Svilengrad | 6,384.19 mi (10,274.35 km) |
| Gallup to Svishtov | 6,255.05 mi (10,066.53 km) |
| Gallup to Targovishte | 6,311.52 mi (10,157.40 km) |
| Gallup to Teteven | 6,261.95 mi (10,077.64 km) |
| Gallup to Troyan | 6,277.32 mi (10,102.37 km) |
| Gallup to Tryavna | 6,301.52 mi (10,141.31 km) |
| Gallup to Tutrakan | 6,267.14 mi (10,085.99 km) |
| Gallup to Varna | 6,351.38 mi (10,221.57 km) |
