| Portland to Karlovo | 6,023.75 mi (9,694.28 km) |
| Portland to Karnobat | 6,064.87 mi (9,760.47 km) |
| Portland to Kavarna | 6,036.72 mi (9,715.16 km) |
| Portland to Kazanlak | 6,036.75 mi (9,715.20 km) |
| Portland to Knezha | 5,955.12 mi (9,583.83 km) |
| Portland to Kostinbrod | 5,981.59 mi (9,626.44 km) |
| Portland to Kozloduy | 5,930.30 mi (9,543.89 km) |
| Portland to Kyustendil | 6,004.67 mi (9,663.58 km) |
| Portland to Levski | 5,983.63 mi (9,629.73 km) |
| Portland to Lom | 5,917.93 mi (9,523.99 km) |
| Portland to Lovech | 5,990.61 mi (9,640.95 km) |
| Portland to Lukovit | 5,975.86 mi (9,617.22 km) |
| Portland to Lyaskovets | 6,011.64 mi (9,674.80 km) |
| Portland to Mezdra | 5,969.96 mi (9,607.72 km) |
| Portland to Momchilgrad | 6,106.58 mi (9,827.59 km) |
