| Prudhoe to Smolyan | 1,515.84 mi (2,439.51 km) |
| Prudhoe to Sofia | 1,411.58 mi (2,271.72 km) |
| Prudhoe to Sopot | 1,464.91 mi (2,357.55 km) |
| Prudhoe to Sozopol | 1,584.13 mi (2,549.42 km) |
| Prudhoe to Sredets | 1,568.82 mi (2,524.78 km) |
| Prudhoe to Stamboliyski | 1,482.48 mi (2,385.81 km) |
| Prudhoe to Stara Zagora | 1,508.05 mi (2,426.96 km) |
| Prudhoe to Svilengrad | 1,560.53 mi (2,511.44 km) |
| Prudhoe to Svishtov | 1,440.75 mi (2,318.67 km) |
| Prudhoe to Targovishte | 1,503.49 mi (2,419.64 km) |
| Prudhoe to Teteven | 1,434.52 mi (2,308.64 km) |
| Prudhoe to Troyan | 1,452.41 mi (2,337.43 km) |
| Prudhoe to Tryavna | 1,481.70 mi (2,384.57 km) |
| Prudhoe to Tutrakan | 1,467.95 mi (2,362.43 km) |
| Prudhoe to Varna | 1,554.78 mi (2,502.18 km) |
