| Olen to Dimitrovgrad | 1,162.40 mi (1,870.71 km) |
| Olen to Dobrich | 1,189.80 mi (1,914.79 km) |
| Olen to Dospat | 1,124.90 mi (1,810.35 km) |
| Olen to Dupnitsa | 1,056.45 mi (1,700.18 km) |
| Olen to Elhovo | 1,195.66 mi (1,924.23 km) |
| Olen to Etropole | 1,065.04 mi (1,714.01 km) |
| Olen to Gabrovo | 1,116.39 mi (1,796.66 km) |
| Olen to Gorna Oryahovitsa | 1,119.92 mi (1,802.34 km) |
| Olen to Gotse Delchev | 1,112.31 mi (1,790.09 km) |
| Olen to Harmanli | 1,179.40 mi (1,898.06 km) |
| Olen to Haskovo | 1,166.28 mi (1,876.94 km) |
| Olen to Ihtiman | 1,075.43 mi (1,730.74 km) |
| Olen to Isperih | 1,142.65 mi (1,838.92 km) |
| Olen to Kardzhali | 1,171.19 mi (1,884.86 km) |
| Olen to Karlovo | 1,105.08 mi (1,778.46 km) |
