| Olen to Provadia | 1,188.43 mi (1,912.59 km) |
| Olen to Radnevo | 1,164.64 mi (1,874.31 km) |
| Olen to Radomir | 1,036.96 mi (1,668.83 km) |
| Olen to Rakitovo | 1,106.33 mi (1,780.47 km) |
| Olen to Rakovski | 1,126.90 mi (1,813.57 km) |
| Olen to Razgrad | 1,136.87 mi (1,829.62 km) |
| Olen to Razlog | 1,087.38 mi (1,749.96 km) |
| Olen to Ruse | 1,102.35 mi (1,774.06 km) |
| Olen to Samokov | 1,069.88 mi (1,721.81 km) |
| Olen to Sandanski | 1,095.25 mi (1,762.63 km) |
| Olen to Sevlievo | 1,100.87 mi (1,771.68 km) |
| Olen to Shumen | 1,163.92 mi (1,873.15 km) |
| Olen to Silistra | 1,144.98 mi (1,842.66 km) |
| Olen to Sliven | 1,164.25 mi (1,873.68 km) |
| Olen to Smolyan | 1,148.44 mi (1,848.23 km) |
