| Oulu to Devnya | 1,508.25 mi (2,427.30 km) |
| Oulu to Dimitrovgrad | 1,586.68 mi (2,553.52 km) |
| Oulu to Dobrich | 1,484.69 mi (2,389.38 km) |
| Oulu to Dospat | 1,615.13 mi (2,599.30 km) |
| Oulu to Dupnitsa | 1,574.51 mi (2,533.94 km) |
| Oulu to Elhovo | 1,579.19 mi (2,541.46 km) |
| Oulu to Etropole | 1,533.62 mi (2,468.13 km) |
| Oulu to Gabrovo | 1,530.25 mi (2,462.70 km) |
| Oulu to Gorna Oryahovitsa | 1,511.85 mi (2,433.09 km) |
| Oulu to Gotse Delchev | 1,621.51 mi (2,609.57 km) |
| Oulu to Harmanli | 1,594.82 mi (2,566.62 km) |
| Oulu to Haskovo | 1,594.74 mi (2,566.49 km) |
| Oulu to Ihtiman | 1,561.25 mi (2,512.58 km) |
| Oulu to Isperih | 1,472.45 mi (2,369.69 km) |
| Oulu to Kardzhali | 1,614.32 mi (2,597.99 km) |
