| Onex to Smolyan | 976.53 mi (1,571.57 km) |
| Onex to Sofia | 881.37 mi (1,418.43 km) |
| Onex to Sopot | 949.75 mi (1,528.47 km) |
| Onex to Sozopol | 1,095.62 mi (1,763.23 km) |
| Onex to Sredets | 1,073.52 mi (1,727.66 km) |
| Onex to Stamboliyski | 953.07 mi (1,533.82 km) |
| Onex to Stara Zagora | 997.86 mi (1,605.90 km) |
| Onex to Svilengrad | 1,041.70 mi (1,676.45 km) |
| Onex to Svishtov | 956.18 mi (1,538.82 km) |
| Onex to Targovishte | 1,022.86 mi (1,646.13 km) |
| Onex to Teteven | 920.28 mi (1,481.05 km) |
| Onex to Troyan | 942.43 mi (1,516.70 km) |
| Onex to Tryavna | 980.02 mi (1,577.19 km) |
| Onex to Tutrakan | 1,008.23 mi (1,622.59 km) |
| Onex to Varna | 1,087.25 mi (1,749.76 km) |
