| Biddeford to Karlovo | 4,515.09 mi (7,266.34 km) |
| Biddeford to Karnobat | 4,602.87 mi (7,407.61 km) |
| Biddeford to Kavarna | 4,621.73 mi (7,437.96 km) |
| Biddeford to Kazanlak | 4,540.14 mi (7,306.65 km) |
| Biddeford to Knezha | 4,450.31 mi (7,162.08 km) |
| Biddeford to Kostinbrod | 4,443.37 mi (7,150.92 km) |
| Biddeford to Kozloduy | 4,424.59 mi (7,120.69 km) |
| Biddeford to Kyustendil | 4,443.46 mi (7,151.06 km) |
| Biddeford to Levski | 4,497.95 mi (7,238.75 km) |
| Biddeford to Lom | 4,402.93 mi (7,085.83 km) |
| Biddeford to Lovech | 4,490.94 mi (7,227.47 km) |
| Biddeford to Lukovit | 4,466.06 mi (7,187.43 km) |
| Biddeford to Lyaskovets | 4,532.47 mi (7,294.31 km) |
| Biddeford to Mezdra | 4,449.28 mi (7,160.42 km) |
| Biddeford to Momchilgrad | 4,586.71 mi (7,381.60 km) |
