| Ostroleka to Smolyan | 806.68 mi (1,298.22 km) |
| Ostroleka to Sofia | 720.86 mi (1,160.10 km) |
| Ostroleka to Sopot | 734.51 mi (1,182.07 km) |
| Ostroleka to Sozopol | 788.38 mi (1,268.78 km) |
| Ostroleka to Sredets | 784.80 mi (1,263.01 km) |
| Ostroleka to Stamboliyski | 767.79 mi (1,235.64 km) |
| Ostroleka to Stara Zagora | 758.47 mi (1,220.64 km) |
| Ostroleka to Svilengrad | 809.81 mi (1,303.26 km) |
| Ostroleka to Svishtov | 675.41 mi (1,086.96 km) |
| Ostroleka to Targovishte | 716.15 mi (1,152.53 km) |
| Ostroleka to Teteven | 712.19 mi (1,146.15 km) |
| Ostroleka to Troyan | 718.35 mi (1,156.07 km) |
| Ostroleka to Tryavna | 727.56 mi (1,170.90 km) |
| Ostroleka to Tutrakan | 664.00 mi (1,068.61 km) |
| Ostroleka to Varna | 740.16 mi (1,191.17 km) |
