| Ostrow Wielkopolski to Smolyan | 767.58 mi (1,235.30 km) |
| Ostrow Wielkopolski to Sofia | 669.90 mi (1,078.10 km) |
| Ostrow Wielkopolski to Sopot | 701.24 mi (1,128.53 km) |
| Ostrow Wielkopolski to Sozopol | 788.16 mi (1,268.42 km) |
| Ostrow Wielkopolski to Sredets | 778.59 mi (1,253.03 km) |
| Ostrow Wielkopolski to Stamboliyski | 729.25 mi (1,173.61 km) |
| Ostrow Wielkopolski to Stara Zagora | 734.92 mi (1,182.73 km) |
| Ostrow Wielkopolski to Svilengrad | 788.77 mi (1,269.40 km) |
| Ostrow Wielkopolski to Svishtov | 655.78 mi (1,055.37 km) |
| Ostrow Wielkopolski to Targovishte | 709.25 mi (1,141.43 km) |
| Ostrow Wielkopolski to Teteven | 674.25 mi (1,085.10 km) |
| Ostrow Wielkopolski to Troyan | 685.95 mi (1,103.93 km) |
| Ostrow Wielkopolski to Tryavna | 704.83 mi (1,134.32 km) |
| Ostrow Wielkopolski to Tutrakan | 663.99 mi (1,068.58 km) |
| Ostrow Wielkopolski to Varna | 748.45 mi (1,204.51 km) |
