| Wallingford Center to Karlovo | 4,695.51 mi (7,556.69 km) |
| Wallingford Center to Karnobat | 4,783.95 mi (7,699.02 km) |
| Wallingford Center to Kavarna | 4,803.57 mi (7,730.60 km) |
| Wallingford Center to Kazanlak | 4,720.73 mi (7,597.28 km) |
| Wallingford Center to Knezha | 4,630.98 mi (7,452.85 km) |
| Wallingford Center to Kostinbrod | 4,623.37 mi (7,440.60 km) |
| Wallingford Center to Kozloduy | 4,605.33 mi (7,411.56 km) |
| Wallingford Center to Kyustendil | 4,622.94 mi (7,439.91 km) |
| Wallingford Center to Levski | 4,678.87 mi (7,529.91 km) |
| Wallingford Center to Lom | 4,583.54 mi (7,376.49 km) |
| Wallingford Center to Lovech | 4,671.61 mi (7,518.23 km) |
| Wallingford Center to Lukovit | 4,646.59 mi (7,477.97 km) |
| Wallingford Center to Lyaskovets | 4,713.42 mi (7,585.51 km) |
| Wallingford Center to Mezdra | 4,629.63 mi (7,450.68 km) |
| Wallingford Center to Momchilgrad | 4,766.67 mi (7,671.22 km) |
