| Oulu to Karlovo | 1,545.88 mi (2,487.85 km) |
| Oulu to Karnobat | 1,547.49 mi (2,490.45 km) |
| Oulu to Kavarna | 1,495.21 mi (2,406.30 km) |
| Oulu to Kazanlak | 1,547.52 mi (2,490.49 km) |
| Oulu to Knezha | 1,487.46 mi (2,393.83 km) |
| Oulu to Kostinbrod | 1,536.21 mi (2,472.29 km) |
| Oulu to Kozloduy | 1,468.45 mi (2,363.24 km) |
| Oulu to Kyustendil | 1,574.34 mi (2,533.66 km) |
| Oulu to Levski | 1,495.75 mi (2,407.18 km) |
| Oulu to Lom | 1,466.53 mi (2,360.15 km) |
| Oulu to Lovech | 1,512.01 mi (2,433.35 km) |
| Oulu to Lukovit | 1,508.07 mi (2,427.00 km) |
| Oulu to Lyaskovets | 1,514.15 mi (2,436.80 km) |
| Oulu to Mezdra | 1,512.24 mi (2,433.71 km) |
| Oulu to Momchilgrad | 1,622.37 mi (2,610.96 km) |
