| Gilbert to Smolyan | 6,569.38 mi (10,572.40 km) |
| Gilbert to Sofia | 6,465.75 mi (10,405.62 km) |
| Gilbert to Sopot | 6,510.69 mi (10,477.94 km) |
| Gilbert to Sozopol | 6,608.37 mi (10,635.14 km) |
| Gilbert to Sredets | 6,598.22 mi (10,618.81 km) |
| Gilbert to Stamboliyski | 6,533.43 mi (10,514.53 km) |
| Gilbert to Stara Zagora | 6,549.19 mi (10,539.90 km) |
| Gilbert to Svilengrad | 6,603.12 mi (10,626.70 km) |
| Gilbert to Svishtov | 6,473.32 mi (10,417.81 km) |
| Gilbert to Targovishte | 6,529.13 mi (10,507.62 km) |
| Gilbert to Teteven | 6,481.47 mi (10,430.92 km) |
| Gilbert to Troyan | 6,496.55 mi (10,455.19 km) |
| Gilbert to Tryavna | 6,520.21 mi (10,493.26 km) |
| Gilbert to Tutrakan | 6,484.15 mi (10,435.24 km) |
| Gilbert to Varna | 6,567.99 mi (10,570.15 km) |
