| Friendswood to Karlovo | 6,164.66 mi (9,921.07 km) |
| Friendswood to Karnobat | 6,247.56 mi (10,054.48 km) |
| Friendswood to Kavarna | 6,259.69 mi (10,074.00 km) |
| Friendswood to Kazanlak | 6,188.53 mi (9,959.48 km) |
| Friendswood to Knezha | 6,098.33 mi (9,814.31 km) |
| Friendswood to Kostinbrod | 6,095.56 mi (9,809.85 km) |
| Friendswood to Kozloduy | 6,072.31 mi (9,772.44 km) |
| Friendswood to Kyustendil | 6,098.33 mi (9,814.31 km) |
| Friendswood to Levski | 6,144.16 mi (9,888.06 km) |
| Friendswood to Lom | 6,051.53 mi (9,739.00 km) |
| Friendswood to Lovech | 6,138.94 mi (9,879.67 km) |
| Friendswood to Lukovit | 6,115.00 mi (9,841.14 km) |
| Friendswood to Lyaskovets | 6,178.36 mi (9,943.11 km) |
| Friendswood to Mezdra | 6,099.36 mi (9,815.97 km) |
| Friendswood to Momchilgrad | 6,238.77 mi (10,040.33 km) |
