| Chillicothe to Smolyan | 5,238.90 mi (8,431.20 km) |
| Chillicothe to Sofia | 5,135.53 mi (8,264.84 km) |
| Chillicothe to Sopot | 5,193.04 mi (8,357.39 km) |
| Chillicothe to Sozopol | 5,316.67 mi (8,556.35 km) |
| Chillicothe to Sredets | 5,300.75 mi (8,530.74 km) |
| Chillicothe to Stamboliyski | 5,207.73 mi (8,381.03 km) |
| Chillicothe to Stara Zagora | 5,237.56 mi (8,429.04 km) |
| Chillicothe to Svilengrad | 5,289.09 mi (8,511.97 km) |
| Chillicothe to Svishtov | 5,172.76 mi (8,324.75 km) |
| Chillicothe to Targovishte | 5,236.13 mi (8,426.73 km) |
| Chillicothe to Teteven | 5,162.43 mi (8,308.12 km) |
| Chillicothe to Troyan | 5,181.32 mi (8,338.53 km) |
| Chillicothe to Tryavna | 5,212.21 mi (8,388.24 km) |
| Chillicothe to Tutrakan | 5,200.98 mi (8,370.17 km) |
| Chillicothe to Varna | 5,287.82 mi (8,509.92 km) |
