| Welwyn Garden City to Karlovo | 1,323.59 mi (2,130.12 km) |
| Welwyn Garden City to Karnobat | 1,412.79 mi (2,273.67 km) |
| Welwyn Garden City to Kavarna | 1,437.10 mi (2,312.78 km) |
| Welwyn Garden City to Kazanlak | 1,348.76 mi (2,170.61 km) |
| Welwyn Garden City to Knezha | 1,259.06 mi (2,026.26 km) |
| Welwyn Garden City to Kostinbrod | 1,252.28 mi (2,015.36 km) |
| Welwyn Garden City to Kozloduy | 1,233.46 mi (1,985.06 km) |
| Welwyn Garden City to Kyustendil | 1,254.12 mi (2,018.30 km) |
| Welwyn Garden City to Levski | 1,307.31 mi (2,103.91 km) |
| Welwyn Garden City to Lom | 1,211.57 mi (1,949.84 km) |
| Welwyn Garden City to Lovech | 1,299.67 mi (2,091.62 km) |
| Welwyn Garden City to Lukovit | 1,274.62 mi (2,051.31 km) |
| Welwyn Garden City to Lyaskovets | 1,341.92 mi (2,159.61 km) |
| Welwyn Garden City to Mezdra | 1,257.77 mi (2,024.19 km) |
| Welwyn Garden City to Momchilgrad | 1,395.64 mi (2,246.06 km) |
