| Northport to Smolyan | 5,715.64 mi (9,198.44 km) |
| Northport to Sofia | 5,612.75 mi (9,032.85 km) |
| Northport to Sopot | 5,671.56 mi (9,127.49 km) |
| Northport to Sozopol | 5,797.57 mi (9,330.29 km) |
| Northport to Sredets | 5,781.11 mi (9,303.80 km) |
| Northport to Stamboliyski | 5,685.20 mi (9,149.45 km) |
| Northport to Stara Zagora | 5,716.60 mi (9,199.98 km) |
| Northport to Svilengrad | 5,767.63 mi (9,282.11 km) |
| Northport to Svishtov | 5,653.29 mi (9,098.08 km) |
| Northport to Targovishte | 5,717.21 mi (9,200.95 km) |
| Northport to Teteven | 5,640.90 mi (9,078.16 km) |
| Northport to Troyan | 5,660.17 mi (9,109.16 km) |
| Northport to Tryavna | 5,691.77 mi (9,160.01 km) |
| Northport to Tutrakan | 5,683.18 mi (9,146.19 km) |
| Northport to Varna | 5,769.99 mi (9,285.90 km) |
