| Williamstown to Karlovo | 4,860.19 mi (7,821.71 km) |
| Williamstown to Karnobat | 4,949.02 mi (7,964.68 km) |
| Williamstown to Kavarna | 4,969.07 mi (7,996.95 km) |
| Williamstown to Kazanlak | 4,885.51 mi (7,862.47 km) |
| Williamstown to Knezha | 4,795.83 mi (7,718.14 km) |
| Williamstown to Kostinbrod | 4,787.80 mi (7,705.22 km) |
| Williamstown to Kozloduy | 4,770.20 mi (7,676.90 km) |
| Williamstown to Kyustendil | 4,787.04 mi (7,704.00 km) |
| Williamstown to Levski | 4,843.85 mi (7,795.42 km) |
| Williamstown to Lom | 4,748.34 mi (7,641.71 km) |
| Williamstown to Lovech | 4,836.44 mi (7,783.50 km) |
| Williamstown to Lukovit | 4,811.35 mi (7,743.12 km) |
| Williamstown to Lyaskovets | 4,878.42 mi (7,851.05 km) |
| Williamstown to Mezdra | 4,794.28 mi (7,715.65 km) |
| Williamstown to Momchilgrad | 4,931.07 mi (7,935.79 km) |
