| Springboro to Karlovo | 5,232.63 mi (8,421.11 km) |
| Springboro to Karnobat | 5,315.50 mi (8,554.47 km) |
| Springboro to Kavarna | 5,328.01 mi (8,574.61 km) |
| Springboro to Kazanlak | 5,256.46 mi (8,459.46 km) |
| Springboro to Knezha | 5,166.25 mi (8,314.28 km) |
| Springboro to Kostinbrod | 5,163.70 mi (8,310.17 km) |
| Springboro to Kozloduy | 5,140.23 mi (8,272.40 km) |
| Springboro to Kyustendil | 5,166.78 mi (8,315.13 km) |
| Springboro to Levski | 5,212.07 mi (8,388.01 km) |
| Springboro to Lom | 5,119.48 mi (8,239.01 km) |
| Springboro to Lovech | 5,206.87 mi (8,379.64 km) |
| Springboro to Lukovit | 5,182.95 mi (8,341.16 km) |
| Springboro to Lyaskovets | 5,246.28 mi (8,443.07 km) |
| Springboro to Mezdra | 5,167.36 mi (8,316.07 km) |
| Springboro to Momchilgrad | 5,306.88 mi (8,540.59 km) |
