| Portsmouth to Smolyan | 1,378.30 mi (2,218.15 km) |
| Portsmouth to Sofia | 1,276.39 mi (2,054.15 km) |
| Portsmouth to Sopot | 1,338.03 mi (2,153.35 km) |
| Portsmouth to Sozopol | 1,472.22 mi (2,369.31 km) |
| Portsmouth to Sredets | 1,453.42 mi (2,339.06 km) |
| Portsmouth to Stamboliyski | 1,349.14 mi (2,171.23 km) |
| Portsmouth to Stara Zagora | 1,384.41 mi (2,228.00 km) |
| Portsmouth to Svilengrad | 1,433.75 mi (2,307.40 km) |
| Portsmouth to Svishtov | 1,327.59 mi (2,136.56 km) |
| Portsmouth to Targovishte | 1,393.60 mi (2,242.78 km) |
| Portsmouth to Teteven | 1,307.42 mi (2,104.08 km) |
| Portsmouth to Troyan | 1,327.71 mi (2,136.74 km) |
| Portsmouth to Tryavna | 1,361.54 mi (2,191.18 km) |
| Portsmouth to Tutrakan | 1,366.80 mi (2,199.65 km) |
| Portsmouth to Varna | 1,452.05 mi (2,336.84 km) |
