| Foster City to Karlovo | 6,521.76 mi (10,495.75 km) |
| Foster City to Karnobat | 6,568.81 mi (10,571.49 km) |
| Foster City to Kavarna | 6,545.31 mi (10,533.66 km) |
| Foster City to Kazanlak | 6,536.36 mi (10,519.25 km) |
| Foster City to Knezha | 6,452.57 mi (10,384.42 km) |
| Foster City to Kostinbrod | 6,475.41 mi (10,421.16 km) |
| Foster City to Kozloduy | 6,427.28 mi (10,343.71 km) |
| Foster City to Kyustendil | 6,495.95 mi (10,454.22 km) |
| Foster City to Levski | 6,483.74 mi (10,434.57 km) |
| Foster City to Lom | 6,413.62 mi (10,321.73 km) |
| Foster City to Lovech | 6,489.19 mi (10,443.35 km) |
| Foster City to Lukovit | 6,473.03 mi (10,417.34 km) |
| Foster City to Lyaskovets | 6,512.90 mi (10,481.50 km) |
| Foster City to Mezdra | 6,465.74 mi (10,405.61 km) |
| Foster City to Momchilgrad | 6,604.46 mi (10,628.85 km) |
