| Portales to Smolyan | 6,252.63 mi (10,062.63 km) |
| Portales to Sofia | 6,148.35 mi (9,894.81 km) |
| Portales to Sopot | 6,198.37 mi (9,975.30 km) |
| Portales to Sozopol | 6,306.55 mi (10,149.41 km) |
| Portales to Sredets | 6,294.16 mi (10,129.46 km) |
| Portales to Stamboliyski | 6,218.23 mi (10,007.27 km) |
| Portales to Stara Zagora | 6,239.42 mi (10,041.38 km) |
| Portales to Svilengrad | 6,292.85 mi (10,127.37 km) |
| Portales to Svishtov | 6,167.13 mi (9,925.03 km) |
| Portales to Targovishte | 6,226.20 mi (10,020.10 km) |
| Portales to Teteven | 6,168.40 mi (9,927.09 km) |
| Portales to Troyan | 6,185.03 mi (9,953.85 km) |
| Portales to Tryavna | 6,211.59 mi (9,996.58 km) |
| Portales to Tutrakan | 6,184.52 mi (9,953.02 km) |
| Portales to Varna | 6,270.15 mi (10,090.83 km) |
