| Big Spring to Karlovo | 6,245.50 mi (10,051.16 km) |
| Big Spring to Karnobat | 6,320.38 mi (10,171.67 km) |
| Big Spring to Kavarna | 6,323.42 mi (10,176.56 km) |
| Big Spring to Kazanlak | 6,267.33 mi (10,086.30 km) |
| Big Spring to Knezha | 6,177.36 mi (9,941.50 km) |
| Big Spring to Kostinbrod | 6,181.24 mi (9,947.74 km) |
| Big Spring to Kozloduy | 6,151.12 mi (9,899.27 km) |
| Big Spring to Kyustendil | 6,188.70 mi (9,959.75 km) |
| Big Spring to Levski | 6,220.09 mi (10,010.27 km) |
| Big Spring to Lom | 6,131.87 mi (9,868.29 km) |
| Big Spring to Lovech | 6,217.58 mi (10,006.23 km) |
| Big Spring to Lukovit | 6,195.29 mi (9,970.36 km) |
| Big Spring to Lyaskovets | 6,253.53 mi (10,064.09 km) |
| Big Spring to Mezdra | 6,181.58 mi (9,948.30 km) |
| Big Spring to Momchilgrad | 6,323.03 mi (10,175.93 km) |
