| Williamsport to Karlovo | 4,874.28 mi (7,844.39 km) |
| Williamsport to Karnobat | 4,960.37 mi (7,982.94 km) |
| Williamsport to Kavarna | 4,976.95 mi (8,009.62 km) |
| Williamsport to Kazanlak | 4,898.91 mi (7,884.04 km) |
| Williamsport to Knezha | 4,808.89 mi (7,739.17 km) |
| Williamsport to Kostinbrod | 4,803.49 mi (7,730.47 km) |
| Williamsport to Kozloduy | 4,783.06 mi (7,697.59 km) |
| Williamsport to Kyustendil | 4,804.60 mi (7,732.25 km) |
| Williamsport to Levski | 4,855.92 mi (7,814.84 km) |
| Williamsport to Lom | 4,761.70 mi (7,663.22 km) |
| Williamsport to Lovech | 4,849.55 mi (7,804.59 km) |
| Williamsport to Lukovit | 4,824.99 mi (7,765.07 km) |
| Williamsport to Lyaskovets | 4,890.35 mi (7,870.25 km) |
| Williamsport to Mezdra | 4,808.62 mi (7,738.72 km) |
| Williamsport to Momchilgrad | 4,946.84 mi (7,961.17 km) |
