| Castel Gandolfo to Karlovo | 624.74 mi (1,005.42 km) |
| Castel Gandolfo to Karnobat | 735.33 mi (1,183.39 km) |
| Castel Gandolfo to Kavarna | 804.91 mi (1,295.37 km) |
| Castel Gandolfo to Kazanlak | 654.83 mi (1,053.84 km) |
| Castel Gandolfo to Knezha | 593.15 mi (954.58 km) |
| Castel Gandolfo to Kostinbrod | 544.72 mi (876.64 km) |
| Castel Gandolfo to Kozloduy | 578.94 mi (931.72 km) |
| Castel Gandolfo to Kyustendil | 515.98 mi (830.40 km) |
| Castel Gandolfo to Levski | 644.38 mi (1,037.03 km) |
| Castel Gandolfo to Lom | 555.21 mi (893.52 km) |
| Castel Gandolfo to Lovech | 622.06 mi (1,001.11 km) |
| Castel Gandolfo to Lukovit | 594.85 mi (957.32 km) |
| Castel Gandolfo to Lyaskovets | 672.17 mi (1,081.75 km) |
| Castel Gandolfo to Mezdra | 571.10 mi (919.10 km) |
| Castel Gandolfo to Momchilgrad | 658.68 mi (1,060.04 km) |
